{ "contractName": "BTCUtils", "abi": [ { "constant": true, "inputs": [], "name": "RETARGET_PERIOD", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "RETARGET_PERIOD_BLOCKS", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "DIFF1_TARGET", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.5.10+commit.5a6ea5b1\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"constant\":true,\"inputs\":[],\"name\":\"RETARGET_PERIOD\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"RETARGET_PERIOD_BLOCKS\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"DIFF1_TARGET\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol\":\"BTCUtils\"},\"evmVersion\":\"petersburg\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol\":{\"keccak256\":\"0xc63829e9d674bb7bb98b264aff17add28db3c19d3ee0ef49531663491af8b087\",\"urls\":[\"bzzr://9a76af9995e01cb82228d6827801929b4697eb83fc60b44faa00d5e62c69ee2d\",\"dweb:/ipfs/QmYRRfdW9qyerUaEyHSEi7LY7WymkKUQQ61YQdxVorGdNW\"]},\"@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol\":{\"keccak256\":\"0x16296b4a97cdac10bb9cd4666d29310fe25897b7644dc04ad053ae09d4aeea9c\",\"urls\":[\"bzzr://27b097b56c0dc070a4e80572e01ffc28d26d83490f56fe0947a4d62ab09e1c48\",\"dweb:/ipfs/QmXwiQCVL8MS3R2NDWwTozngTjrD3SmWmZ6fbNGgQiwdDd\"]},\"@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol\":{\"keccak256\":\"0x22d34c04c68c2a77ee83e2ef3756f6e6bad6ad675560d777e612315d7eb83935\",\"urls\":[\"bzzr://a3312aa9977669832679852788efb21430fa70e5779243861ac6400fdc72f3de\",\"dweb:/ipfs/QmWADdVTCSyvtgb76AxFFkAr9h9jbY57Mj5X6xiEqCqmMu\"]}},\"version\":1}", "bytecode": "0x60bb610025600b82828239805160001a60731461001857fe5b30600052607381538281f3fe730000000000000000000000000000000000000000301460806040526004361060475760003560e01c8063056e04ec14604c5780638cc71569146064578063d4258ca714606a575b600080fd5b60526070565b60408051918252519081900360200190f35b60526077565b6052607d565b6212750081565b6107e081565b61ffff60d01b8156fea265627a7a723058203afc93c32c4b9299818d1118d07fcbad9813b8dde670ec73a33478ce37094cf164736f6c634300050a0032", "deployedBytecode": "0x730000000000000000000000000000000000000000301460806040526004361060475760003560e01c8063056e04ec14604c5780638cc71569146064578063d4258ca714606a575b600080fd5b60526070565b60408051918252519081900360200190f35b60526077565b6052607d565b6212750081565b6107e081565b61ffff60d01b8156fea265627a7a723058203afc93c32c4b9299818d1118d07fcbad9813b8dde670ec73a33478ce37094cf164736f6c634300050a0032", "sourceMap": "176:26876:5:-;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24", "deployedSourceMap": "176:26876:5:-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;444:62;;;:::i;:::-;;;;;;;;;;;;;;;;535:53;;;:::i;340:97::-;;;:::i;444:62::-;486:20;444:62;:::o;535:53::-;584:4;535:53;:::o;340:97::-;-1:-1:-1;;;340:97:5;:::o", "source": "pragma solidity ^0.5.10;\n\n/** @title BitcoinSPV */\n/** @author Summa (https://summa.one) */\n\nimport {BytesLib} from \"./BytesLib.sol\";\nimport {SafeMath} from \"./SafeMath.sol\";\n\nlibrary BTCUtils {\n using BytesLib for bytes;\n using SafeMath for uint256;\n\n // The target at minimum Difficulty. Also the target of the genesis block\n uint256 public constant DIFF1_TARGET = 0xffff0000000000000000000000000000000000000000000000000000;\n\n uint256 public constant RETARGET_PERIOD = 2 * 7 * 24 * 60 * 60; // 2 weeks in seconds\n uint256 public constant RETARGET_PERIOD_BLOCKS = 2016; // 2 weeks in blocks\n\n /* ***** */\n /* UTILS */\n /* ***** */\n\n /// @notice Determines the length of a VarInt in bytes\n /// @dev A VarInt of >1 byte is prefixed with a flag indicating its length\n /// @param _flag The first byte of a VarInt\n /// @return The number of non-flag bytes in the VarInt\n function determineVarIntDataLength(bytes memory _flag) internal pure returns (uint8) {\n if (uint8(_flag[0]) == 0xff) {\n return 8; // one-byte flag, 8 bytes data\n }\n if (uint8(_flag[0]) == 0xfe) {\n return 4; // one-byte flag, 4 bytes data\n }\n if (uint8(_flag[0]) == 0xfd) {\n return 2; // one-byte flag, 2 bytes data\n }\n\n return 0; // flag is data\n }\n\n /// @notice Changes the endianness of a byte array\n /// @dev Returns a new, backwards, bytes\n /// @param _b The bytes to reverse\n /// @return The reversed bytes\n function reverseEndianness(bytes memory _b) internal pure returns (bytes memory) {\n bytes memory _newValue = new bytes(_b.length);\n\n for (uint i = 0; i < _b.length; i++) {\n _newValue[_b.length - i - 1] = _b[i];\n }\n\n return _newValue;\n }\n\n /// @notice Changes the endianness of a uint256\n /// @dev https://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel\n /// @param _b The unsigned integer to reverse\n /// @return The reversed value\n function reverseUint256(uint256 _b) internal pure returns (uint256 v) {\n v = _b;\n\n // swap bytes\n v = ((v >> 8) & 0x00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF) |\n ((v & 0x00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF) << 8);\n // swap 2-byte long pairs\n v = ((v >> 16) & 0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) |\n ((v & 0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) << 16);\n // swap 4-byte long pairs\n v = ((v >> 32) & 0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF) |\n ((v & 0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF) << 32);\n // swap 8-byte long pairs\n v = ((v >> 64) & 0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF) |\n ((v & 0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF) << 64);\n // swap 16-byte long pairs\n v = (v >> 128) | (v << 128);\n }\n\n /// @notice Converts big-endian bytes to a uint\n /// @dev Traverses the byte array and sums the bytes\n /// @param _b The big-endian bytes-encoded integer\n /// @return The integer representation\n function bytesToUint(bytes memory _b) internal pure returns (uint256) {\n uint256 _number;\n\n for (uint i = 0; i < _b.length; i++) {\n _number = _number + uint8(_b[i]) * (2 ** (8 * (_b.length - (i + 1))));\n }\n\n return _number;\n }\n\n /// @notice Get the last _num bytes from a byte array\n /// @param _b The byte array to slice\n /// @param _num The number of bytes to extract from the end\n /// @return The last _num bytes of _b\n function lastBytes(bytes memory _b, uint256 _num) internal pure returns (bytes memory) {\n uint256 _start = _b.length.sub(_num);\n\n return _b.slice(_start, _num);\n }\n\n /// @notice Implements bitcoin's hash160 (rmd160(sha2()))\n /// @dev abi.encodePacked changes the return to bytes instead of bytes32\n /// @param _b The pre-image\n /// @return The digest\n function hash160(bytes memory _b) internal pure returns (bytes memory) {\n return abi.encodePacked(ripemd160(abi.encodePacked(sha256(_b))));\n }\n\n /// @notice Implements bitcoin's hash256 (double sha2)\n /// @dev abi.encodePacked changes the return to bytes instead of bytes32\n /// @param _b The pre-image\n /// @return The digest\n function hash256(bytes memory _b) internal pure returns (bytes32) {\n return abi.encodePacked(sha256(abi.encodePacked(sha256(_b)))).toBytes32();\n }\n\n /// @notice Implements bitcoin's hash256 (double sha2)\n /// @dev sha2 is precompiled smart contract located at address(2)\n /// @param _b The pre-image\n /// @return The digest\n function hash256View(bytes memory _b) internal view returns (bytes32 res) {\n assembly {\n let ptr := mload(0x40)\n pop(staticcall(gas, 2, add(_b, 32), mload(_b), ptr, 32))\n pop(staticcall(gas, 2, ptr, 32, ptr, 32))\n res := mload(ptr)\n }\n }\n\n /* ************ */\n /* Legacy Input */\n /* ************ */\n\n /// @notice Extracts the nth input from the vin (0-indexed)\n /// @dev Iterates over the vin. If you need to extract several, write a custom function\n /// @param _vin The vin as a tightly-packed byte array\n /// @param _index The 0-indexed location of the input to extract\n /// @return The input as a byte array\n function extractInputAtIndex(bytes memory _vin, uint8 _index) internal pure returns (bytes memory) {\n uint256 _len;\n bytes memory _remaining;\n\n uint256 _offset = 1;\n\n for (uint8 _i = 0; _i < _index; _i ++) {\n _remaining = _vin.slice(_offset, _vin.length - _offset);\n _len = determineInputLength(_remaining);\n _offset = _offset + _len;\n }\n\n _remaining = _vin.slice(_offset, _vin.length - _offset);\n _len = determineInputLength(_remaining);\n return _vin.slice(_offset, _len);\n }\n\n /// @notice Determines whether an input is legacy\n /// @dev False if no scriptSig, otherwise True\n /// @param _input The input\n /// @return True for legacy, False for witness\n function isLegacyInput(bytes memory _input) internal pure returns (bool) {\n return _input.keccak256Slice(36, 1) != keccak256(hex\"00\");\n }\n\n /// @notice Determines the length of an input from its scriptsig\n /// @dev 36 for outpoint, 1 for scriptsig length, 4 for sequence\n /// @param _input The input\n /// @return The length of the input in bytes\n function determineInputLength(bytes memory _input) internal pure returns (uint256) {\n uint8 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n return 36 + 1 + _varIntDataLen + _scriptSigLen + 4;\n }\n\n /// @notice Extracts the LE sequence bytes from an input\n /// @dev Sequence is used for relative time locks\n /// @param _input The LEGACY input\n /// @return The sequence bytes (LE uint)\n function extractSequenceLELegacy(bytes memory _input) internal pure returns (bytes memory) {\n uint8 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n return _input.slice(36 + 1 + _varIntDataLen + _scriptSigLen, 4);\n }\n\n /// @notice Extracts the sequence from the input\n /// @dev Sequence is a 4-byte little-endian number\n /// @param _input The LEGACY input\n /// @return The sequence number (big-endian uint)\n function extractSequenceLegacy(bytes memory _input) internal pure returns (uint32) {\n bytes memory _leSeqence = extractSequenceLELegacy(_input);\n bytes memory _beSequence = reverseEndianness(_leSeqence);\n return uint32(bytesToUint(_beSequence));\n }\n /// @notice Extracts the VarInt-prepended scriptSig from the input in a tx\n /// @dev Will return hex\"00\" if passed a witness input\n /// @param _input The LEGACY input\n /// @return The length-prepended script sig\n function extractScriptSig(bytes memory _input) internal pure returns (bytes memory) {\n uint8 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n return _input.slice(36, 1 + _varIntDataLen + _scriptSigLen);\n }\n\n /// @notice Determines the length of a scriptSig in an input\n /// @dev Will return 0 if passed a witness input\n /// @param _input The LEGACY input\n /// @return The length of the script sig\n function extractScriptSigLen(bytes memory _input) internal pure returns (uint8, uint256) {\n bytes memory _varIntTag = _input.slice(36, 1);\n uint8 _varIntDataLen = determineVarIntDataLength(_varIntTag);\n uint256 _len;\n if (_varIntDataLen == 0) {\n _len = uint8(_varIntTag[0]);\n } else {\n _len = bytesToUint(reverseEndianness(_input.slice(36 + 1, _varIntDataLen)));\n }\n return (_varIntDataLen, _len);\n }\n\n\n /* ************* */\n /* Witness Input */\n /* ************* */\n\n /// @notice Extracts the LE sequence bytes from an input\n /// @dev Sequence is used for relative time locks\n /// @param _input The WITNESS input\n /// @return The sequence bytes (LE uint)\n function extractSequenceLEWitness(bytes memory _input) internal pure returns (bytes memory) {\n return _input.slice(37, 4);\n }\n\n /// @notice Extracts the sequence from the input in a tx\n /// @dev Sequence is a 4-byte little-endian number\n /// @param _input The WITNESS input\n /// @return The sequence number (big-endian uint)\n function extractSequenceWitness(bytes memory _input) internal pure returns (uint32) {\n bytes memory _leSeqence = extractSequenceLEWitness(_input);\n bytes memory _inputeSequence = reverseEndianness(_leSeqence);\n return uint32(bytesToUint(_inputeSequence));\n }\n\n /// @notice Extracts the outpoint from the input in a tx\n /// @dev 32 byte tx id with 4 byte index\n /// @param _input The input\n /// @return The outpoint (LE bytes of prev tx hash + LE bytes of prev tx index)\n function extractOutpoint(bytes memory _input) internal pure returns (bytes memory) {\n return _input.slice(0, 36);\n }\n\n /// @notice Extracts the outpoint tx id from an input\n /// @dev 32 byte tx id\n /// @param _input The input\n /// @return The tx id (little-endian bytes)\n function extractInputTxIdLE(bytes memory _input) internal pure returns (bytes32) {\n return _input.slice(0, 32).toBytes32();\n }\n\n /// @notice Extracts the outpoint index from an input\n /// @dev 32 byte tx id\n /// @param _input The input\n /// @return The tx id (big-endian bytes)\n function extractInputTxId(bytes memory _input) internal pure returns (bytes32) {\n bytes memory _leId = abi.encodePacked(extractInputTxIdLE(_input));\n bytes memory _beId = reverseEndianness(_leId);\n return _beId.toBytes32();\n }\n\n /// @notice Extracts the LE tx input index from the input in a tx\n /// @dev 4 byte tx index\n /// @param _input The input\n /// @return The tx index (little-endian bytes)\n function extractTxIndexLE(bytes memory _input) internal pure returns (bytes memory) {\n return _input.slice(32, 4);\n }\n\n /// @notice Extracts the tx input index from the input in a tx\n /// @dev 4 byte tx index\n /// @param _input The input\n /// @return The tx index (big-endian uint)\n function extractTxIndex(bytes memory _input) internal pure returns (uint32) {\n bytes memory _leIndex = extractTxIndexLE(_input);\n bytes memory _beIndex = reverseEndianness(_leIndex);\n return uint32(bytesToUint(_beIndex));\n }\n\n /* ****** */\n /* Output */\n /* ****** */\n\n /// @notice Determines the length of an output\n /// @dev 5 types: WPKH, WSH, PKH, SH, and OP_RETURN\n /// @param _output The output\n /// @return The length indicated by the prefix, error if invalid length\n function determineOutputLength(bytes memory _output) internal pure returns (uint256) {\n uint8 _len = uint8(_output.slice(8, 1)[0]);\n require(_len < 0xfd, \"Multi-byte VarInts not supported\");\n\n return _len + 8 + 1; // 8 byte value, 1 byte for _len itself\n }\n\n /// @notice Extracts the output at a given index in the TxIns vector\n /// @dev Iterates over the vout. If you need to extract multiple, write a custom function\n /// @param _vout The _vout to extract from\n /// @param _index The 0-indexed location of the output to extract\n /// @return The specified output\n function extractOutputAtIndex(bytes memory _vout, uint8 _index) internal pure returns (bytes memory) {\n uint256 _len;\n bytes memory _remaining;\n\n uint256 _offset = 1;\n\n for (uint8 _i = 0; _i < _index; _i ++) {\n _remaining = _vout.slice(_offset, _vout.length - _offset);\n _len = determineOutputLength(_remaining);\n _offset = _offset + _len;\n }\n\n _remaining = _vout.slice(_offset, _vout.length - _offset);\n _len = determineOutputLength(_remaining);\n return _vout.slice(_offset, _len);\n }\n\n /// @notice Extracts the output script length\n /// @dev Indexes the length prefix on the pk_script\n /// @param _output The output\n /// @return The 1 byte length prefix\n function extractOutputScriptLen(bytes memory _output) internal pure returns (bytes memory) {\n return _output.slice(8, 1);\n }\n\n /// @notice Extracts the value bytes from the output in a tx\n /// @dev Value is an 8-byte little-endian number\n /// @param _output The output\n /// @return The output value as LE bytes\n function extractValueLE(bytes memory _output) internal pure returns (bytes memory) {\n return _output.slice(0, 8);\n }\n\n /// @notice Extracts the value from the output in a tx\n /// @dev Value is an 8-byte little-endian number\n /// @param _output The output\n /// @return The output value\n function extractValue(bytes memory _output) internal pure returns (uint64) {\n bytes memory _leValue = extractValueLE(_output);\n bytes memory _beValue = reverseEndianness(_leValue);\n return uint64(bytesToUint(_beValue));\n }\n\n /// @notice Extracts the data from an op return output\n /// @dev Returns hex\"\" if no data or not an op return\n /// @param _output The output\n /// @return Any data contained in the opreturn output, null if not an op return\n function extractOpReturnData(bytes memory _output) internal pure returns (bytes memory) {\n if (_output.keccak256Slice(9, 1) != keccak256(hex\"6a\")) {\n return hex\"\";\n }\n bytes memory _dataLen = _output.slice(10, 1);\n return _output.slice(11, bytesToUint(_dataLen));\n }\n\n /// @notice Extracts the hash from the output script\n /// @dev Determines type by the length prefix and validates format\n /// @param _output The output\n /// @return The hash committed to by the pk_script, or null for errors\n function extractHash(bytes memory _output) internal pure returns (bytes memory) {\n if (uint8(_output.slice(9, 1)[0]) == 0) {\n uint256 _len = uint8(extractOutputScriptLen(_output)[0]) - 2;\n // Check for maliciously formatted witness outputs\n if (uint8(_output.slice(10, 1)[0]) != uint8(_len)) {\n return hex\"\";\n }\n return _output.slice(11, _len);\n } else {\n bytes32 _tag = _output.keccak256Slice(8, 3);\n // p2pkh\n if (_tag == keccak256(hex\"1976a9\")) {\n // Check for maliciously formatted p2pkh\n if (uint8(_output.slice(11, 1)[0]) != 0x14 ||\n _output.keccak256Slice(_output.length - 2, 2) != keccak256(hex\"88ac\")) {\n return hex\"\";\n }\n return _output.slice(12, 20);\n //p2sh\n } else if (_tag == keccak256(hex\"17a914\")) {\n // Check for maliciously formatted p2sh\n if (uint8(_output.slice(_output.length - 1, 1)[0]) != 0x87) {\n return hex\"\";\n }\n return _output.slice(11, 20);\n }\n }\n return hex\"\"; /* NB: will trigger on OPRETURN and non-standard that don't overrun */\n }\n\n /* ********** */\n /* Witness TX */\n /* ********** */\n\n\n /// @notice Checks that the vin passed up is properly formatted\n /// @dev Consider a vin with a valid vout in its scriptsig\n /// @param _vin Raw bytes length-prefixed input vector\n /// @return True if it represents a validly formatted vin\n function validateVin(bytes memory _vin) internal pure returns (bool) {\n uint256 _offset = 1;\n uint8 _nIns = uint8(_vin.slice(0, 1)[0]);\n\n // Not valid if it says there are too many or no inputs\n if (_nIns >= 0xfd || _nIns == 0) {\n return false;\n }\n\n for (uint8 i = 0; i < _nIns; i++) {\n // Grab the next input and determine its length.\n // Increase the offset by that much\n _offset += determineInputLength(_vin.slice(_offset, _vin.length - _offset));\n\n // Returns false we jump past the end\n if (_offset > _vin.length) {\n return false;\n }\n }\n\n // Returns false if we're not exactly at the end\n return _offset == _vin.length;\n }\n\n /// @notice Checks that the vin passed up is properly formatted\n /// @dev Consider a vin with a valid vout in its scriptsig\n /// @param _vout Raw bytes length-prefixed output vector\n /// @return True if it represents a validly formatted bout\n function validateVout(bytes memory _vout) internal pure returns (bool) {\n uint256 _offset = 1;\n uint8 _nOuts = uint8(_vout.slice(0, 1)[0]);\n\n // Not valid if it says there are too many or no inputs\n if (_nOuts >= 0xfd || _nOuts == 0) {\n return false;\n }\n\n for (uint8 i = 0; i < _nOuts; i++) {\n // Grab the next input and determine its length.\n // Increase the offset by that much\n _offset += determineOutputLength(_vout.slice(_offset, _vout.length - _offset));\n\n // Returns false we jump past the end\n if (_offset > _vout.length) {\n return false;\n }\n }\n\n // Returns false if we're not exactly at the end\n return _offset == _vout.length;\n }\n\n\n\n /* ************ */\n /* Block Header */\n /* ************ */\n\n /// @notice Extracts the transaction merkle root from a block header\n /// @dev Use verifyHash256Merkle to verify proofs with this root\n /// @param _header The header\n /// @return The merkle root (little-endian)\n function extractMerkleRootLE(bytes memory _header) internal pure returns (bytes memory) {\n return _header.slice(36, 32);\n }\n\n /// @notice Extracts the transaction merkle root from a block header\n /// @dev Use verifyHash256Merkle to verify proofs with this root\n /// @param _header The header\n /// @return The merkle root (big-endian)\n function extractMerkleRootBE(bytes memory _header) internal pure returns (bytes memory) {\n return reverseEndianness(extractMerkleRootLE(_header));\n }\n\n /// @notice Extracts the target from a block header\n /// @dev Target is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n /// @param _header The header\n /// @return The target threshold\n function extractTarget(bytes memory _header) internal pure returns (uint256) {\n bytes memory _m = _header.slice(72, 3);\n uint8 _e = uint8(_header[75]);\n uint256 _mantissa = bytesToUint(reverseEndianness(_m));\n uint _exponent = _e - 3;\n\n return _mantissa * (256 ** _exponent);\n }\n\n /// @notice Calculate difficulty from the difficulty 1 target and current target\n /// @dev Difficulty 1 is 0x1d00ffff on mainnet and testnet\n /// @dev Difficulty 1 is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n /// @param _target The current target\n /// @return The block difficulty (bdiff)\n function calculateDifficulty(uint256 _target) internal pure returns (uint256) {\n // Difficulty 1 calculated from 0x1d00ffff\n return DIFF1_TARGET.div(_target);\n }\n\n /// @notice Extracts the previous block's hash from a block header\n /// @dev Block headers do NOT include block number :(\n /// @param _header The header\n /// @return The previous block's hash (little-endian)\n function extractPrevBlockLE(bytes memory _header) internal pure returns (bytes memory) {\n return _header.slice(4, 32);\n }\n\n /// @notice Extracts the previous block's hash from a block header\n /// @dev Block headers do NOT include block number :(\n /// @param _header The header\n /// @return The previous block's hash (big-endian)\n function extractPrevBlockBE(bytes memory _header) internal pure returns (bytes memory) {\n return reverseEndianness(extractPrevBlockLE(_header));\n }\n\n /// @notice Extracts the timestamp from a block header\n /// @dev Time is not 100% reliable\n /// @param _header The header\n /// @return The timestamp (little-endian bytes)\n function extractTimestampLE(bytes memory _header) internal pure returns (bytes memory) {\n return _header.slice(68, 4);\n }\n\n /// @notice Extracts the timestamp from a block header\n /// @dev Time is not 100% reliable\n /// @param _header The header\n /// @return The timestamp (uint)\n function extractTimestamp(bytes memory _header) internal pure returns (uint32) {\n return uint32(bytesToUint(reverseEndianness(extractTimestampLE(_header))));\n }\n\n /// @notice Extracts the expected difficulty from a block header\n /// @dev Does NOT verify the work\n /// @param _header The header\n /// @return The difficulty as an integer\n function extractDifficulty(bytes memory _header) internal pure returns (uint256) {\n return calculateDifficulty(extractTarget(_header));\n }\n\n /// @notice Concatenates and hashes two inputs for merkle proving\n /// @param _a The first hash\n /// @param _b The second hash\n /// @return The double-sha256 of the concatenated hashes\n function _hash256MerkleStep(bytes memory _a, bytes memory _b) internal pure returns (bytes32) {\n return hash256(abi.encodePacked(_a, _b));\n }\n\n /// @notice Verifies a Bitcoin-style merkle tree\n /// @dev Leaves are 0-indexed.\n /// @param _proof The proof. Tightly packed LE sha256 hashes. The last hash is the root\n /// @param _index The index of the leaf\n /// @return true if the proof is valid, else false\n function verifyHash256Merkle(bytes memory _proof, uint _index) internal pure returns (bool) {\n // Not an even number of hashes\n if (_proof.length % 32 != 0) {\n return false;\n }\n\n // Special case for coinbase-only blocks\n if (_proof.length == 32) {\n return true;\n }\n\n // Should never occur\n if (_proof.length == 64) {\n return false;\n }\n\n uint _idx = _index;\n bytes32 _root = _proof.slice(_proof.length - 32, 32).toBytes32();\n bytes32 _current = _proof.slice(0, 32).toBytes32();\n\n for (uint i = 1; i < (_proof.length.div(32)) - 1; i++) {\n if (_idx % 2 == 1) {\n _current = _hash256MerkleStep(_proof.slice(i * 32, 32), abi.encodePacked(_current));\n } else {\n _current = _hash256MerkleStep(abi.encodePacked(_current), _proof.slice(i * 32, 32));\n }\n _idx = _idx >> 1;\n }\n return _current == _root;\n }\n\n /*\n NB: https://github.com/bitcoin/bitcoin/blob/78dae8caccd82cfbfd76557f1fb7d7557c7b5edb/src/pow.cpp#L49-L72\n NB: We get a full-bitlength target from this. For comparison with\n header-encoded targets we need to mask it with the header target\n e.g. (full & truncated) == truncated\n */\n /// @notice performs the bitcoin difficulty retarget\n /// @dev implements the Bitcoin algorithm precisely\n /// @param _previousTarget the target of the previous period\n /// @param _firstTimestamp the timestamp of the first block in the difficulty period\n /// @param _secondTimestamp the timestamp of the last block in the difficulty period\n /// @return the new period's target threshold\n function retargetAlgorithm(\n uint256 _previousTarget,\n uint256 _firstTimestamp,\n uint256 _secondTimestamp\n ) internal pure returns (uint256) {\n uint256 _elapsedTime = _secondTimestamp.sub(_firstTimestamp);\n\n // Normalize ratio to factor of 4 if very long or very short\n if (_elapsedTime < RETARGET_PERIOD.div(4)) {\n _elapsedTime = RETARGET_PERIOD.div(4);\n }\n if (_elapsedTime > RETARGET_PERIOD.mul(4)) {\n _elapsedTime = RETARGET_PERIOD.mul(4);\n }\n\n /*\n NB: high targets e.g. ffff0020 can cause overflows here\n so we divide it by 256**2, then multiply by 256**2 later\n we know the target is evenly divisible by 256**2, so this isn't an issue\n */\n\n uint256 _adjusted = _previousTarget.div(65536).mul(_elapsedTime);\n return _adjusted.div(RETARGET_PERIOD).mul(65536);\n }\n}\n", "sourcePath": "@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol", "ast": { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol", "exportedSymbols": { "BTCUtils": [ 4082 ] }, "id": 4083, "nodeType": "SourceUnit", "nodes": [ { "id": 2465, "literals": [ "solidity", "^", "0.5", ".10" ], "nodeType": "PragmaDirective", "src": "0:24:5" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol", "file": "./BytesLib.sol", "id": 2467, "nodeType": "ImportDirective", "scope": 4083, "sourceUnit": 4270, "src": "93:40:5", "symbolAliases": [ { "foreign": 2466, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol", "file": "./SafeMath.sol", "id": 2469, "nodeType": "ImportDirective", "scope": 4083, "sourceUnit": 4367, "src": "134:40:5", "symbolAliases": [ { "foreign": 2468, "local": null } ], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": null, "fullyImplemented": true, "id": 4082, "linearizedBaseContracts": [ 4082 ], "name": "BTCUtils", "nodeType": "ContractDefinition", "nodes": [ { "id": 2472, "libraryName": { "contractScope": null, "id": 2470, "name": "BytesLib", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4269, "src": "205:8:5", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesLib_$4269", "typeString": "library BytesLib" } }, "nodeType": "UsingForDirective", "src": "199:25:5", "typeName": { "id": 2471, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "218:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": 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2768, "nodeType": "Return", "src": "4441:64:5" } ] }, "documentation": "@notice Implements bitcoin's hash160 (rmd160(sha2()))\n @dev abi.encodePacked changes the return to bytes instead of bytes32\n @param _b The pre-image\n @return The digest", "id": 2770, "implemented": true, "kind": "function", "modifiers": [], "name": "hash160", "nodeType": "FunctionDefinition", "parameters": { "id": 2753, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2752, "name": "_b", "nodeType": "VariableDeclaration", "scope": 2770, "src": "4377:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2751, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "4377:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "4376:17:5" }, "returnParameters": { "id": 2756, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2755, "name": "", "nodeType": "VariableDeclaration", "scope": 2770, "src": "4417:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2754, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "4417:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "4416:14:5" }, "scope": 4082, "src": "4360:152:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2791, "nodeType": "Block", "src": "4816:90:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2783, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2772, "src": "4881:2:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2782, "name": "sha256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5032, "src": "4874:6:5", "typeDescriptions": { "typeIdentifier": "t_function_sha256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2784, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4874:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "expression": { "argumentTypes": null, "id": 2780, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5010, "src": "4857:3:5", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 2781, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "4857:16:5", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 2785, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4857:28:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2779, "name": "sha256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5032, "src": "4850:6:5", "typeDescriptions": { "typeIdentifier": "t_function_sha256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2786, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4850:36:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "expression": { "argumentTypes": null, "id": 2777, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5010, "src": "4833:3:5", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 2778, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "4833:16:5", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 2787, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4833:54:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2788, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "toBytes32", "nodeType": "MemberAccess", "referencedDeclaration": 4244, "src": "4833:64:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2789, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4833:66:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 2776, "id": 2790, "nodeType": "Return", "src": "4826:73:5" } ] }, "documentation": "@notice Implements bitcoin's hash256 (double sha2)\n @dev abi.encodePacked changes the return to bytes instead of bytes32\n @param _b The pre-image\n @return The digest", "id": 2792, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256", "nodeType": "FunctionDefinition", "parameters": { "id": 2773, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2772, "name": "_b", "nodeType": "VariableDeclaration", "scope": 2792, "src": "4767:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2771, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "4767:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "4766:17:5" }, "returnParameters": { "id": 2776, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2775, "name": "", "nodeType": "VariableDeclaration", "scope": 2792, "src": "4807:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 2774, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4807:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "4806:9:5" }, "scope": 4082, "src": "4750:156:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2800, "nodeType": "Block", "src": "5211:224:5", "statements": [ { "externalReferences": [ { "_b": { "declaration": 2794, "isOffset": false, "isSlot": false, "src": "5306:2:5", "valueSize": 1 } }, { "res": { "declaration": 2797, "isOffset": false, "isSlot": false, "src": "5402:3:5", "valueSize": 1 } }, { "_b": { "declaration": 2794, "isOffset": false, "isSlot": false, "src": "5321:2:5", "valueSize": 1 } } ], "id": 2799, "nodeType": "InlineAssembly", "operations": "{\n let ptr := mload(0x40)\n pop(staticcall(gas(), 2, add(_b, 32), mload(_b), ptr, 32))\n pop(staticcall(gas(), 2, ptr, 32, ptr, 32))\n res := mload(ptr)\n}", "src": "5221:208:5" } ] }, "documentation": "@notice Implements bitcoin's hash256 (double sha2)\n @dev sha2 is precompiled smart contract located at address(2)\n @param _b The pre-image\n @return The digest", "id": 2801, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256View", "nodeType": "FunctionDefinition", "parameters": { "id": 2795, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2794, "name": "_b", "nodeType": "VariableDeclaration", "scope": 2801, "src": "5158:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2793, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5158:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5157:17:5" }, "returnParameters": { "id": 2798, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2797, "name": "res", "nodeType": "VariableDeclaration", "scope": 2801, "src": "5198:11:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 2796, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "5198:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "5197:13:5" }, "scope": 4082, "src": "5137:298:5", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2878, "nodeType": "Block", "src": "5974:469:5", "statements": [ { "assignments": [ 2811 ], "declarations": [ { "constant": false, "id": 2811, "name": "_len", "nodeType": "VariableDeclaration", "scope": 2878, "src": "5984:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2810, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5984:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 2812, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "5984:12:5" }, { "assignments": [ 2814 ], "declarations": [ { "constant": false, "id": 2814, "name": "_remaining", "nodeType": "VariableDeclaration", "scope": 2878, "src": "6006:23:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2813, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6006:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 2815, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "6006:23:5" }, { "assignments": [ 2817 ], "declarations": [ { "constant": false, "id": 2817, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 2878, "src": "6040:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2816, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6040:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 2819, "initialValue": { "argumentTypes": null, "hexValue": "31", "id": 2818, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6058:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "VariableDeclarationStatement", "src": "6040:19:5" }, { "body": { "id": 2853, "nodeType": "Block", "src": "6109:171:5", "statements": [ { "expression": { "argumentTypes": null, "id": 2839, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2830, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2814, "src": "6123:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2833, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6147:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2837, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2834, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6156:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2835, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "6156:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 2836, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6170:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6156:21:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 2831, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6136:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2832, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6136:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2838, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6136:42:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "6123:55:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2840, "nodeType": "ExpressionStatement", "src": "6123:55:5" }, { "expression": { "argumentTypes": null, "id": 2845, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2841, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6192:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2843, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2814, "src": "6220:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2842, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2929, "src": "6199:20:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 2844, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6199:32:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6192:39:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2846, "nodeType": "ExpressionStatement", "src": "6192:39:5" }, { "expression": { "argumentTypes": null, "id": 2851, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2847, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6245:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2850, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 2848, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6255:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 2849, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6265:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6255:14:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6245:24:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2852, "nodeType": "ExpressionStatement", "src": "6245:24:5" } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 2826, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 2824, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2821, "src": "6089:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 2825, "name": "_index", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2805, "src": "6094:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "6089:11:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 2854, "initializationExpression": { "assignments": [ 2821 ], "declarations": [ { "constant": false, "id": 2821, "name": "_i", "nodeType": "VariableDeclaration", "scope": 2854, "src": "6075:8:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2820, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "6075:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 2823, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 2822, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6086:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "6075:12:5" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 2828, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "6102:5:5", "subExpression": { "argumentTypes": null, "id": 2827, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2821, "src": "6102:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "id": 2829, "nodeType": "ExpressionStatement", "src": "6102:5:5" }, "nodeType": "ForStatement", "src": "6070:210:5" }, { "expression": { "argumentTypes": null, "id": 2864, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2855, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2814, "src": "6290:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2858, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6314:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2862, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2859, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6323:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2860, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "6323:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 2861, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6337:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6323:21:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 2856, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6303:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2857, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6303:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2863, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6303:42:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "6290:55:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2865, "nodeType": "ExpressionStatement", "src": "6290:55:5" }, { "expression": { "argumentTypes": null, "id": 2870, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2866, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6355:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2868, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2814, "src": "6383:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2867, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2929, "src": "6362:20:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 2869, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6362:32:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6355:39:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2871, "nodeType": "ExpressionStatement", "src": "6355:39:5" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2874, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6422:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 2875, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6431:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 2872, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6411:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2873, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6411:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2876, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6411:25:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 2809, "id": 2877, "nodeType": "Return", "src": "6404:32:5" } ] }, "documentation": "@notice Extracts the nth input from the vin (0-indexed)\n @dev Iterates over the vin. If you need to extract several, write a custom function\n @param _vin The vin as a tightly-packed byte array\n @param _index The 0-indexed location of the input to extract\n @return The input as a byte array", "id": 2879, "implemented": true, "kind": "function", "modifiers": [], "name": "extractInputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 2806, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2803, "name": "_vin", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5904:17:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2802, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5904:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 2805, "name": "_index", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5923:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2804, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "5923:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "src": "5903:33:5" }, "returnParameters": { "id": 2809, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2808, "name": "", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5960:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2807, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5960:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5959:14:5" }, "scope": 4082, "src": "5875:568:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2896, "nodeType": "Block", "src": "6743:74:5", "statements": [ { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 2894, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 2888, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6782:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "hexValue": "31", "id": 2889, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6786:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 2886, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2881, "src": "6760:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2887, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "keccak256Slice", "nodeType": "MemberAccess", "referencedDeclaration": 4268, "src": "6760:21:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes32)" } }, "id": 2890, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6760:28:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "00", "id": 2892, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "6802:7:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" }, "value": "\u0000" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" } ], "id": 2891, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5017, "src": "6792:9:5", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2893, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6792:18:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "6760:50:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 2885, "id": 2895, "nodeType": "Return", "src": "6753:57:5" } ] }, "documentation": "@notice Determines whether an input is legacy\n @dev False if no scriptSig, otherwise True\n @param _input The input\n @return True for legacy, False for witness", "id": 2897, "implemented": true, "kind": "function", "modifiers": [], "name": "isLegacyInput", "nodeType": "FunctionDefinition", "parameters": { "id": 2882, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2881, "name": "_input", "nodeType": "VariableDeclaration", "scope": 2897, "src": "6693:19:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2880, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6693:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "6692:21:5" }, "returnParameters": { "id": 2885, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2884, "name": "", "nodeType": "VariableDeclaration", "scope": 2897, "src": "6737:4:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2883, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6737:4:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "6736:6:5" }, "scope": 4082, "src": "6670:147:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2928, "nodeType": "Block", "src": "7158:199:5", "statements": [ { "assignments": [ 2905 ], "declarations": [ { "constant": false, "id": 2905, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 2928, "src": "7168:20:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2904, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "7168:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 2906, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "7168:20:5" }, { "assignments": [ 2908 ], "declarations": [ { "constant": false, "id": 2908, "name": "_scriptSigLen", "nodeType": "VariableDeclaration", "scope": 2928, "src": "7198:21:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2907, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7198:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 2909, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "7198:21:5" }, { "expression": { "argumentTypes": null, "id": 2916, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 2910, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2905, "src": "7230:14:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, { "argumentTypes": null, "id": 2911, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2908, "src": "7246:13:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 2912, "isConstant": false, "isInlineArray": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "TupleExpression", "src": "7229:31:5", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint8_$_t_uint256_$", "typeString": "tuple(uint8,uint256)" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2914, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2899, "src": "7283:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2913, "name": "extractScriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3080, "src": "7263:19:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint8_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint8,uint256)" } }, "id": 2915, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7263:27:5", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint8_$_t_uint256_$", "typeString": "tuple(uint8,uint256)" } }, "src": "7229:61:5", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2917, "nodeType": "ExpressionStatement", "src": "7229:61:5" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2926, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2924, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 2922, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, "id": 2920, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "3336", "id": 2918, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7307:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 2919, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7312:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "7307:6:5", "typeDescriptions": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 2921, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2905, "src": "7316:14:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": 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"uint256" } }, "functionReturnParameters": 2903, "id": 2927, "nodeType": "Return", "src": "7300:50:5" } ] }, "documentation": "@notice Determines the length of an input from its scriptsig\n @dev 36 for outpoint, 1 for scriptsig length, 4 for sequence\n @param _input The input\n @return The length of the input in bytes", "id": 2929, "implemented": true, "kind": "function", "modifiers": [], "name": "determineInputLength", "nodeType": "FunctionDefinition", "parameters": { "id": 2900, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2899, "name": "_input", "nodeType": "VariableDeclaration", "scope": 2929, "src": "7105:19:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2898, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "7105:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, 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"typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 3016, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3000, "src": "8944:13:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8923:34:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3010, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2991, "src": "8906:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3011, "isConstant": false, "isLValue": false, "isPure": false, 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null, "visibility": "internal" } ], "id": 3037, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 3034, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9344:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "hexValue": "31", "id": 3035, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9348:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 3032, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3023, "src": "9331:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3033, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "9331:12:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3036, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9331:19:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "9305:45:5" }, { "assignments": [ 3039 ], "declarations": [ { "constant": false, "id": 3039, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 3079, "src": "9360:20:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3038, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "9360:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3043, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3041, "name": "_varIntTag", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3031, "src": "9409:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3040, "name": "determineVarIntDataLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2535, "src": "9383:25:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint8_$", "typeString": "function (bytes memory) pure returns (uint8)" } }, "id": 3042, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9383:37:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "9360:60:5" }, { "assignments": [ 3045 ], "declarations": [ { "constant": false, "id": 3045, "name": "_len", "nodeType": "VariableDeclaration", "scope": 3079, "src": "9430:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3044, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9430:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3046, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "9430:12:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3049, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3047, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3039, "src": "9456:14:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3048, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9474:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "9456:19:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": { "id": 3073, "nodeType": "Block", "src": "9535:100:5", "statements": [ { "expression": { "argumentTypes": null, "id": 3071, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3059, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3045, "src": "9549:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, "id": 3066, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "3336", "id": 3064, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9599:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 3065, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9604:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "9599:6:5", "typeDescriptions": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" } }, { "argumentTypes": null, "id": 3067, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3039, "src": "9607:14:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, { "typeIdentifier": "t_uint8", "typeString": "uint8" } ], "expression": { "argumentTypes": null, "id": 3062, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3023, "src": "9586:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3063, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "9586:12:5", "typeDescriptions": { "typeIdentifier": 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false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9568:55:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3060, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2726, "src": "9556:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3070, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9556:68:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9549:75:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3072, "nodeType": "ExpressionStatement", "src": "9549:75:5" } ] }, "id": 3074, "nodeType": "IfStatement", "src": "9452:183:5", "trueBody": { "id": 3058, "nodeType": "Block", "src": "9477:52:5", "statements": [ { "expression": { "argumentTypes": null, "id": 3056, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3050, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3045, "src": "9491:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 3052, "name": "_varIntTag", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3031, "src": "9504:10:5", "typeDescriptions": { "typeIdentifier": 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"constant": false, "id": 3260, "name": "_len", "nodeType": "VariableDeclaration", "scope": 3327, "src": "13709:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3259, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13709:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3261, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "13709:12:5" }, { "assignments": [ 3263 ], "declarations": [ { "constant": false, "id": 3263, "name": "_remaining", "nodeType": "VariableDeclaration", "scope": 3327, "src": "13731:23:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3262, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13731:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 3264, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "13731:23:5" }, { "assignments": [ 3266 ], "declarations": [ { "constant": false, "id": 3266, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 3327, "src": "13765:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3265, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13765:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3268, "initialValue": { "argumentTypes": null, "hexValue": "31", "id": 3267, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13783:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "VariableDeclarationStatement", "src": "13765:19:5" }, { "body": { "id": 3302, "nodeType": "Block", "src": "13834:174:5", "statements": [ { "expression": { "argumentTypes": null, "id": 3288, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3279, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3263, "src": "13848:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3282, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "13873:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3286, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3283, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "13882:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3284, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "13882:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 3285, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "13897:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13882:22:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3280, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "13861:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3281, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "13861:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3287, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13861:44:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "13848:57:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3289, "nodeType": "ExpressionStatement", "src": "13848:57:5" }, { "expression": { "argumentTypes": null, "id": 3294, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3290, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3260, "src": "13919:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3292, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3263, "src": "13948:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3291, "name": "determineOutputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3250, "src": "13926:21:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3293, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13926:33:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13919:40:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3295, "nodeType": "ExpressionStatement", "src": "13919:40:5" }, { "expression": { "argumentTypes": null, "id": 3300, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3296, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "13973:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3299, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3297, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "13983:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 3298, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3260, "src": "13993:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13983:14:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13973:24:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3301, "nodeType": "ExpressionStatement", "src": "13973:24:5" } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3275, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3273, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3270, "src": "13814:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 3274, "name": "_index", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3254, "src": "13819:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "13814:11:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3303, "initializationExpression": { "assignments": [ 3270 ], "declarations": [ { "constant": false, "id": 3270, "name": "_i", "nodeType": "VariableDeclaration", "scope": 3303, "src": "13800:8:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3269, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "13800:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3272, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 3271, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13811:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "13800:12:5" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 3277, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "13827:5:5", "subExpression": { "argumentTypes": null, "id": 3276, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3270, "src": "13827:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "id": 3278, "nodeType": "ExpressionStatement", "src": "13827:5:5" }, "nodeType": "ForStatement", "src": "13795:213:5" }, { "expression": { "argumentTypes": null, "id": 3313, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3304, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3263, "src": "14018:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3307, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "14043:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3311, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3308, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "14052:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3309, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "14052:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 3310, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "14067:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14052:22:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3305, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "14031:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3306, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "14031:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3312, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14031:44:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "14018:57:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3314, "nodeType": "ExpressionStatement", "src": "14018:57:5" }, { "expression": { "argumentTypes": null, "id": 3319, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3315, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3260, "src": "14085:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3317, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3263, "src": "14114:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3316, "name": "determineOutputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3250, "src": "14092:21:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3318, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14092:33:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14085:40:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3320, "nodeType": "ExpressionStatement", "src": "14085:40:5" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3323, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "14154:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 3324, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3260, "src": "14163:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3321, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "14142:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3322, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "14142:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3325, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14142:26:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3258, "id": 3326, "nodeType": "Return", "src": "14135:33:5" } ] }, "documentation": "@notice Extracts the output at a given index in the TxIns vector\n @dev Iterates over the vout. If you need to extract multiple, write a custom function\n @param _vout The _vout to extract from\n @param _index The 0-indexed location of the output to extract\n @return The specified output", "id": 3328, "implemented": true, "kind": "function", "modifiers": [], "name": "extractOutputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 3255, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3252, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13628:18:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3251, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13628:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3254, "name": "_index", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13648:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3253, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "13648:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "src": "13627:34:5" }, "returnParameters": { "id": 3258, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3257, "name": "", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13685:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3256, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13685:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "13684:14:5" }, "scope": 4082, "src": "13598:577:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3341, "nodeType": "Block", "src": "14485:43:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "38", "id": 3337, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14516:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, "value": "8" }, { "argumentTypes": null, "hexValue": "31", "id": 3338, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14519:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 3335, "name": "_output", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3330, "src": "14502:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3336, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "14502:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3339, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": 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"ElementaryTypeName", "src": "16229:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "16228:22:5" }, "returnParameters": { "id": 3425, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3424, "name": "", "nodeType": "VariableDeclaration", "scope": 3558, "src": "16274:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3423, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "16274:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "16273:14:5" }, "scope": 4082, "src": "16208:1308:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3630, "nodeType": "Block", "src": "17927:716:5", "statements": [ { "assignments": [ 3566 ], "declarations": [ { "constant": false, "id": 3566, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 3630, "src": "17937:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3565, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "17937:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3568, "initialValue": { "argumentTypes": null, "hexValue": "31", "id": 3567, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "17955:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "VariableDeclarationStatement", "src": "17937:19:5" }, { "assignments": [ 3570 ], "declarations": [ { "constant": false, "id": 3570, "name": "_nIns", "nodeType": "VariableDeclaration", "scope": 3630, "src": "17966:11:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3569, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "17966:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3580, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3574, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "17997:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, { "argumentTypes": null, "hexValue": "31", "id": 3575, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "18000:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 3572, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3560, "src": "17986:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3573, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "17986:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3576, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "17986:16:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3578, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 3577, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "18003:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "17986:19:5", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 3571, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "17980:5:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 3579, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "17980:26:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "17966:40:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 3587, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3583, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3581, "name": "_nIns", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3570, "src": "18085:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "argumentTypes": null, "hexValue": "30786664", "id": 3582, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "18094:4:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_253_by_1", "typeString": "int_const 253" }, "value": "0xfd" }, "src": "18085:13:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3586, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3584, "name": "_nIns", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3570, "src": "18102:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3585, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "18111:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "18102:10:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "18085:27:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 3591, "nodeType": "IfStatement", "src": "18081:70:5", "trueBody": { "id": 3590, "nodeType": "Block", "src": "18114:37:5", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 3588, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "18135:5:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 3564, "id": 3589, "nodeType": "Return", "src": "18128:12:5" } ] } }, { "body": { "id": 3623, "nodeType": "Block", "src": "18195:345:5", "statements": [ { "expression": { "argumentTypes": null, "id": 3613, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3602, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3566, "src": "18318:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3606, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3566, "src": "18361:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3610, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3607, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3560, "src": "18370:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3608, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "18370:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 3609, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3566, "src": "18384:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18370:21:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3604, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3560, "src": "18350:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3605, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "18350:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3611, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "18350:42:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3603, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2929, "src": "18329:20:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3612, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "18329:64:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18318:75:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3614, "nodeType": "ExpressionStatement", "src": "18318:75:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3618, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3615, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3566, "src": "18462:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3616, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3560, "src": "18472:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3617, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "18472:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18462:21:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 3622, "nodeType": "IfStatement", "src": "18458:72:5", "trueBody": { "id": 3621, "nodeType": "Block", "src": "18485:45:5", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 3619, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "18510:5:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 3564, "id": 3620, "nodeType": "Return", "src": "18503:12:5" } ] } } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3598, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3596, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3593, "src": "18179:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 3597, "name": "_nIns", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3570, "src": "18183:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "18179:9:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3624, "initializationExpression": { "assignments": [ 3593 ], "declarations": [ { "constant": false, "id": 3593, "name": "i", "nodeType": "VariableDeclaration", "scope": 3624, "src": "18166:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3592, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "18166:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3595, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 3594, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "18176:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "18166:11:5" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 3600, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "18190:3:5", "subExpression": { "argumentTypes": null, "id": 3599, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3593, "src": "18190:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "id": 3601, "nodeType": "ExpressionStatement", "src": "18190:3:5" }, "nodeType": "ForStatement", "src": "18161:379:5" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3628, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3625, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3566, "src": "18614:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3626, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3560, "src": "18625:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3627, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "18625:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18614:22:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3564, "id": 3629, "nodeType": "Return", "src": "18607:29:5" } ] }, "documentation": "@notice Checks that the vin passed up is properly formatted\n @dev Consider a vin with a valid vout in its scriptsig\n @param _vin Raw bytes length-prefixed input vector\n @return True if it represents a validly formatted vin", "id": 3631, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVin", "nodeType": "FunctionDefinition", "parameters": { "id": 3561, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3560, "name": "_vin", "nodeType": "VariableDeclaration", "scope": 3631, "src": "17879:17:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3559, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "17879:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "17878:19:5" }, "returnParameters": { "id": 3564, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3563, "name": "", "nodeType": "VariableDeclaration", "scope": 3631, "src": "17921:4:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 3562, "name": "bool", "nodeType": "ElementaryTypeName", "src": "17921:4:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": 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"19389:78:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3691, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3688, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3639, "src": "19536:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3689, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19546:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3690, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "19546:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19536:22:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 3695, "nodeType": "IfStatement", "src": "19532:73:5", "trueBody": { "id": 3694, "nodeType": "Block", "src": "19560:45:5", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 3692, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "19585:5:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 3637, "id": 3693, "nodeType": "Return", "src": "19578:12:5" } ] } } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3671, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3669, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3666, "src": "19249:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 3670, "name": "_nOuts", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3643, "src": "19253:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "19249:10:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3697, "initializationExpression": { "assignments": [ 3666 ], "declarations": [ { "constant": false, "id": 3666, "name": "i", "nodeType": "VariableDeclaration", "scope": 3697, "src": "19236:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3665, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "19236:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3668, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 3667, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19246:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "19236:11:5" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 3673, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "19261:3:5", "subExpression": { "argumentTypes": null, "id": 3672, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3666, "src": "19261:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "id": 3674, "nodeType": "ExpressionStatement", "src": "19261:3:5" }, "nodeType": "ForStatement", "src": "19231:384:5" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3701, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3698, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3639, "src": "19689:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3699, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19700:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3700, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "19700:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19689:23:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3637, "id": 3702, "nodeType": "Return", "src": "19682:30:5" } ] }, "documentation": "@notice Checks that the vin passed up is properly formatted\n @dev Consider a vin with a valid vout in its scriptsig\n @param _vout Raw bytes length-prefixed output vector\n @return True if it represents a validly formatted bout", "id": 3704, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVout", "nodeType": "FunctionDefinition", "parameters": { "id": 3634, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3633, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 3704, "src": "18944:18:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3632, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "18944:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "18943:20:5" }, "returnParameters": { "id": 3637, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3636, "name": "", "nodeType": "VariableDeclaration", "scope": 3704, "src": "18987:4:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 3635, 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"20176:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" }, "value": "32" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" } ], "expression": { "argumentTypes": null, "id": 3711, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3706, "src": "20158:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3712, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "20158:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": 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"stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3705, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20082:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20081:22:5" }, "returnParameters": { "id": 3710, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3709, "name": "", "nodeType": "VariableDeclaration", "scope": 3718, "src": "20127:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3708, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20127:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20126:14:5" }, "scope": 4082, "src": "20053:133:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3731, "nodeType": "Block", "src": "20533:71:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3727, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3720, "src": "20588:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3726, "name": "extractMerkleRootLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3718, "src": "20568:19:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3728, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20568:28:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3725, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "20550:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3729, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20550:47:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3724, "id": 3730, "nodeType": "Return", "src": "20543:54:5" } ] }, "documentation": "@notice Extracts the transaction merkle root from a block header\n @dev Use verifyHash256Merkle to verify proofs with this root\n @param _header The header\n @return The merkle root (big-endian)", "id": 3732, "implemented": true, "kind": "function", "modifiers": [], "name": "extractMerkleRootBE", "nodeType": "FunctionDefinition", "parameters": { "id": 3721, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3720, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3732, "src": "20474:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3719, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20474:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": 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"stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3739, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20945:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 3746, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3732", "id": 3743, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20977:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_72_by_1", "typeString": "int_const 72" }, "value": "72" }, { "argumentTypes": null, "hexValue": "33", "id": 3744, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20981:1:5", "subdenomination": null, 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returns (bytes memory)" } }, "id": 3745, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20963:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "20945:38:5" }, { "assignments": [ 3748 ], "declarations": [ { "constant": false, "id": 3748, "name": "_e", "nodeType": "VariableDeclaration", "scope": 3776, "src": "20993:8:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3747, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "20993:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3754, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 3750, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3734, "src": "21010:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3752, "indexExpression": { "argumentTypes": null, "hexValue": "3735", "id": 3751, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21018:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_75_by_1", "typeString": "int_const 75" }, "value": "75" }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "21010:11:5", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 3749, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "21004:5:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 3753, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21004:18:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "20993:29:5" }, { "assignments": [ 3756 ], "declarations": [ { "constant": false, "id": 3756, "name": "_mantissa", "nodeType": "VariableDeclaration", "scope": 3776, "src": "21032:17:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3755, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21032:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3762, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3759, "name": "_m", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3740, "src": "21082:2:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3758, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "21064:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3760, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21064:21:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3757, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2726, "src": "21052:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3761, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21052:34:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "21032:54:5" }, { "assignments": [ 3764 ], "declarations": [ { "constant": false, "id": 3764, "name": "_exponent", "nodeType": "VariableDeclaration", "scope": 3776, "src": "21096:14:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3763, "name": "uint", "nodeType": "ElementaryTypeName", "src": "21096:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3768, "initialValue": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3767, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3765, "name": "_e", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3748, "src": "21113:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "hexValue": "33", "id": 3766, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21118:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_3_by_1", "typeString": "int_const 3" }, "value": "3" }, "src": "21113:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "21096:23:5" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3774, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3769, "name": "_mantissa", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3756, "src": "21137:9:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3772, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "323536", "id": 3770, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21150:3:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_256_by_1", "typeString": "int_const 256" }, "value": "256" }, "nodeType": "BinaryOperation", "operator": "**", "rightExpression": { "argumentTypes": null, "id": 3771, "name": "_exponent", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3764, "src": "21157:9:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "21150:16:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 3773, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "21149:18:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "21137:30:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3738, "id": 3775, "nodeType": "Return", "src": "21130:37:5" } ] }, "documentation": "@notice Extracts the target from a block header\n @dev Target is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n @param _header The header\n @return The target threshold", "id": 3777, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTarget", "nodeType": "FunctionDefinition", "parameters": { "id": 3735, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3734, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3777, "src": "20881:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3733, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20881:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20880:22:5" }, "returnParameters": { "id": 3738, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3737, "name": "", "nodeType": "VariableDeclaration", "scope": 3777, "src": "20926:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3736, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "20926:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "20925:9:5" }, "scope": 4082, "src": "20858:316:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3789, "nodeType": "Block", "src": "21632:100:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3786, "name": "_target", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3779, "src": "21717:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3784, "name": "DIFF1_TARGET", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2478, "src": "21700:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3785, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "div", "nodeType": "MemberAccess", "referencedDeclaration": 4319, "src": "21700:16:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 3787, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21700:25:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3783, "id": 3788, "nodeType": "Return", "src": "21693:32:5" } ] }, "documentation": "@notice Calculate difficulty from the difficulty 1 target and current target\n @dev Difficulty 1 is 0x1d00ffff on mainnet and testnet\n @dev Difficulty 1 is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n @param _target The current target\n @return The block difficulty (bdiff)", "id": 3790, "implemented": true, "kind": "function", "modifiers": [], "name": "calculateDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 3780, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3779, "name": "_target", "nodeType": "VariableDeclaration", "scope": 3790, "src": "21583:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3778, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21583:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "21582:17:5" }, "returnParameters": { "id": 3783, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3782, "name": "", "nodeType": "VariableDeclaration", "scope": 3790, "src": "21623:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3781, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21623:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "21622:9:5" }, "scope": 4082, "src": "21554:178:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3803, "nodeType": "Block", "src": "22078:44:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "34", "id": 3799, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22109:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" }, { "argumentTypes": null, "hexValue": "3332", "id": 3800, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22112:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" }, "value": "32" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" } ], "expression": { "argumentTypes": null, "id": 3797, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3792, "src": "22095:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3798, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "22095:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3801, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22095:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3796, "id": 3802, "nodeType": "Return", "src": "22088:27:5" } ] }, "documentation": "@notice Extracts the previous block's hash from a block header\n @dev Block headers do NOT include block number :(\n @param _header The header\n @return The previous block's hash (little-endian)", "id": 3804, "implemented": true, "kind": "function", "modifiers": [], "name": "extractPrevBlockLE", "nodeType": "FunctionDefinition", "parameters": { "id": 3793, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3792, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3804, "src": "22019:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3791, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22019:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22018:22:5" }, "returnParameters": { "id": 3796, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3795, "name": "", "nodeType": "VariableDeclaration", "scope": 3804, "src": "22064:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3794, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22064:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22063:14:5" }, "scope": 4082, "src": "21991:131:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3817, "nodeType": "Block", "src": "22465:70:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3813, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3806, "src": "22519:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3812, "name": "extractPrevBlockLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3804, "src": "22500:18:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3814, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22500:27:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3811, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "22482:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3815, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22482:46:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3810, "id": 3816, "nodeType": "Return", "src": "22475:53:5" } ] }, "documentation": "@notice Extracts the previous block's hash from a block header\n @dev Block headers do NOT include block number :(\n @param _header The header\n @return The previous block's hash (big-endian)", "id": 3818, "implemented": true, "kind": "function", "modifiers": [], "name": "extractPrevBlockBE", "nodeType": "FunctionDefinition", "parameters": { "id": 3807, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3806, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3818, "src": "22406:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3805, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22406:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22405:22:5" }, "returnParameters": { "id": 3810, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3809, "name": "", "nodeType": "VariableDeclaration", "scope": 3818, "src": "22451:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3808, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22451:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22450:14:5" }, "scope": 4082, "src": "22378:157:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3831, "nodeType": "Block", "src": "22844:44:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3638", "id": 3827, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22875:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_68_by_1", "typeString": "int_const 68" }, "value": "68" }, { "argumentTypes": null, "hexValue": "34", "id": 3828, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22879:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_68_by_1", "typeString": "int_const 68" }, { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" } ], "expression": { "argumentTypes": null, "id": 3825, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3820, "src": "22861:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3826, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "22861:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3829, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22861:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3824, "id": 3830, "nodeType": "Return", "src": "22854:27:5" } ] }, "documentation": "@notice Extracts the timestamp from a block header\n @dev Time is not 100% reliable\n @param _header The header\n @return The timestamp (little-endian bytes)", "id": 3832, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestampLE", "nodeType": "FunctionDefinition", "parameters": { "id": 3821, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3820, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3832, "src": "22785:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3819, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22785:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22784:22:5" }, "returnParameters": { "id": 3824, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3823, "name": "", "nodeType": "VariableDeclaration", "scope": 3832, "src": "22830:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3822, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22830:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22829:14:5" }, "scope": 4082, "src": "22757:131:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3849, "nodeType": "Block", "src": "23174:91:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3843, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3834, "src": "23247:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3842, "name": "extractTimestampLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3832, "src": "23228:18:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3844, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23228:27:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3841, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "23210:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3845, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23210:46:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3840, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2726, "src": "23198:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3846, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23198:59:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3839, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "23191:6:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint32_$", "typeString": "type(uint32)" }, "typeName": "uint32" }, "id": 3847, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23191:67:5", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "functionReturnParameters": 3838, "id": 3848, "nodeType": "Return", "src": "23184:74:5" } ] }, "documentation": "@notice Extracts the timestamp from a block header\n @dev Time is not 100% reliable\n @param _header The header\n @return The timestamp (uint)", "id": 3850, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestamp", "nodeType": "FunctionDefinition", "parameters": { "id": 3835, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3834, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3850, "src": "23121:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3833, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "23121:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "23120:22:5" }, "returnParameters": { "id": 3838, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3837, "name": "", "nodeType": "VariableDeclaration", "scope": 3850, "src": "23166:6:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" }, "typeName": { "id": 3836, "name": "uint32", "nodeType": "ElementaryTypeName", "src": "23166:6:5", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "value": null, "visibility": "internal" } ], "src": "23165:8:5" }, "scope": 4082, "src": "23095:170:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3863, "nodeType": "Block", "src": "23570:67:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3859, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3852, "src": "23621:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3858, "name": "extractTarget", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3777, "src": "23607:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3860, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23607:22:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3857, "name": "calculateDifficulty", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3790, "src": "23587:19:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$returns$_t_uint256_$", "typeString": "function (uint256) pure returns (uint256)" } }, "id": 3861, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23587:43:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3856, "id": 3862, "nodeType": "Return", "src": "23580:50:5" } ] }, "documentation": "@notice Extracts the expected difficulty from a block header\n @dev Does NOT verify the work\n @param _header The header\n @return The difficulty as an integer", "id": 3864, "implemented": true, "kind": "function", "modifiers": [], "name": "extractDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 3853, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3852, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3864, "src": "23516:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3851, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "23516:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "23515:22:5" }, "returnParameters": { "id": 3856, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3855, "name": "", "nodeType": "VariableDeclaration", "scope": 3864, "src": "23561:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3854, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "23561:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "23560:9:5" }, "scope": 4082, "src": "23489:148:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3881, "nodeType": "Block", "src": "23967:57:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3876, "name": "_a", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3866, "src": "24009:2:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 3877, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3868, "src": "24013:2:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "expression": { "argumentTypes": null, "id": 3874, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5010, "src": "23992:3:5", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3875, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "23992:16:5", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 3878, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23992:24:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3873, "name": "hash256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2792, "src": "23984:7:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 3879, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23984:33:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 3872, "id": 3880, "nodeType": "Return", "src": "23977:40:5" } ] }, "documentation": "@notice Concatenates and hashes two inputs for merkle proving\n @param _a The first hash\n @param _b The second hash\n @return The double-sha256 of the concatenated hashes", "id": 3882, "implemented": true, "kind": "function", "modifiers": [], "name": "_hash256MerkleStep", "nodeType": "FunctionDefinition", "parameters": { "id": 3869, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3866, "name": "_a", "nodeType": "VariableDeclaration", "scope": 3882, "src": "23901:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3865, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "23901:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3868, "name": "_b", "nodeType": "VariableDeclaration", "scope": 3882, "src": "23918:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3867, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "23918:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "23900:34:5" }, "returnParameters": { "id": 3872, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3871, "name": "", "nodeType": "VariableDeclaration", "scope": 3882, "src": "23958:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 3870, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "23958:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "23957:9:5" }, "scope": 4082, "src": "23873:151:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 4013, "nodeType": "Block", "src": "24437:917:5", "statements": [ { "condition": 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Get the last _num bytes from a byte array\n @param _b The byte array to slice\n @param _num The number of bytes to extract from the end\n @return The last _num bytes of _b", "id": 2750, "implemented": true, "kind": "function", "modifiers": [], "name": "lastBytes", "nodeType": "FunctionDefinition", "parameters": { "id": 2731, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2728, "name": "_b", "nodeType": "VariableDeclaration", "scope": 2750, "src": "3958:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2727, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "3958:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 2730, "name": "_num", "nodeType": "VariableDeclaration", "scope": 2750, "src": "3975:12:5", "stateVariable": false, 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"typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2789, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4833:66:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 2776, "id": 2790, "nodeType": "Return", "src": "4826:73:5" } ] }, "documentation": "@notice Implements bitcoin's hash256 (double sha2)\n @dev abi.encodePacked changes the return to bytes instead of bytes32\n @param _b The pre-image\n @return The digest", "id": 2792, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256", "nodeType": "FunctionDefinition", "parameters": { "id": 2773, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2772, "name": "_b", "nodeType": "VariableDeclaration", "scope": 2792, "src": "4767:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { 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"internal" }, { "body": { "id": 2800, "nodeType": "Block", "src": "5211:224:5", "statements": [ { "externalReferences": [ { "_b": { "declaration": 2794, "isOffset": false, "isSlot": false, "src": "5306:2:5", "valueSize": 1 } }, { "res": { "declaration": 2797, "isOffset": false, "isSlot": false, "src": "5402:3:5", "valueSize": 1 } }, { "_b": { "declaration": 2794, "isOffset": false, "isSlot": false, "src": "5321:2:5", "valueSize": 1 } } ], "id": 2799, "nodeType": "InlineAssembly", "operations": "{\n let ptr := mload(0x40)\n pop(staticcall(gas(), 2, add(_b, 32), mload(_b), ptr, 32))\n pop(staticcall(gas(), 2, ptr, 32, ptr, 32))\n res := mload(ptr)\n}", "src": "5221:208:5" } ] }, "documentation": "@notice Implements bitcoin's hash256 (double sha2)\n @dev sha2 is precompiled smart contract located at address(2)\n @param _b The pre-image\n @return The digest", "id": 2801, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256View", "nodeType": "FunctionDefinition", 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"typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2832, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6136:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2838, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6136:42:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "6123:55:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2840, "nodeType": "ExpressionStatement", "src": "6123:55:5" }, { 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"typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2852, "nodeType": "ExpressionStatement", "src": "6245:24:5" } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 2826, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 2824, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2821, "src": "6089:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 2825, "name": "_index", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2805, "src": "6094:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "6089:11:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 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"typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2858, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6314:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2862, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2859, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6323:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2860, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "6323:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 2861, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6337:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6323:21:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 2856, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6303:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2857, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6303:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2863, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6303:42:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "6290:55:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2865, "nodeType": "ExpressionStatement", "src": "6290:55:5" }, { "expression": { "argumentTypes": null, "id": 2870, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 2866, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6355:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2868, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2814, "src": "6383:10:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 2867, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2929, "src": "6362:20:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 2869, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6362:32:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6355:39:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2871, "nodeType": "ExpressionStatement", "src": "6355:39:5" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2874, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "6422:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 2875, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2811, "src": "6431:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 2872, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2803, "src": "6411:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2873, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "6411:10:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 2876, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6411:25:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 2809, "id": 2877, "nodeType": "Return", "src": "6404:32:5" } ] }, "documentation": "@notice Extracts the nth input from the vin (0-indexed)\n @dev Iterates over the vin. If you need to extract several, write a custom function\n @param _vin The vin as a tightly-packed byte array\n @param _index The 0-indexed location of the input to extract\n @return The input as a byte array", "id": 2879, "implemented": true, "kind": "function", "modifiers": [], "name": "extractInputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 2806, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2803, "name": "_vin", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5904:17:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2802, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5904:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 2805, "name": "_index", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5923:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2804, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "5923:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "src": "5903:33:5" }, "returnParameters": { "id": 2809, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2808, "name": "", "nodeType": "VariableDeclaration", "scope": 2879, "src": "5960:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2807, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5960:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5959:14:5" }, "scope": 4082, "src": "5875:568:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2896, "nodeType": "Block", "src": "6743:74:5", "statements": [ { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 2894, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 2888, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6782:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "hexValue": "31", "id": 2889, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6786:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 2886, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2881, "src": "6760:6:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2887, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "keccak256Slice", "nodeType": "MemberAccess", "referencedDeclaration": 4268, "src": "6760:21:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes32)" } }, "id": 2890, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6760:28:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "00", "id": 2892, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "6802:7:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" }, "value": "\u0000" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" } ], "id": 2891, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5017, "src": "6792:9:5", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 2893, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6792:18:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "6760:50:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 2885, "id": 2895, "nodeType": "Return", "src": "6753:57:5" } ] }, "documentation": "@notice Determines whether an input is legacy\n @dev False if no scriptSig, otherwise True\n @param _input The input\n @return True for legacy, False for witness", "id": 2897, "implemented": true, "kind": "function", "modifiers": [], "name": "isLegacyInput", "nodeType": "FunctionDefinition", "parameters": { "id": 2882, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2881, "name": "_input", "nodeType": "VariableDeclaration", "scope": 2897, "src": "6693:19:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 2880, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6693:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "6692:21:5" }, "returnParameters": { "id": 2885, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2884, "name": "", "nodeType": "VariableDeclaration", "scope": 2897, "src": "6737:4:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2883, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6737:4:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "6736:6:5" }, "scope": 4082, "src": "6670:147:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 2928, "nodeType": "Block", "src": "7158:199:5", "statements": [ { "assignments": [ 2905 ], "declarations": [ { "constant": false, "id": 2905, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 2928, "src": "7168:20:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2904, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "7168:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 2906, "initialValue": null, "nodeType": 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"argumentTypes": null, "id": 2955, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2937, "src": "7857:14:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "7848:23:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 2957, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2940, "src": "7874:13:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7848:39:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "34", "id": 2959, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7889:1:5", "subdenomination": null, 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false, "names": [], "nodeType": "FunctionCall", "src": "13926:33:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13919:40:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3295, "nodeType": "ExpressionStatement", "src": "13919:40:5" }, { "expression": { "argumentTypes": null, "id": 3300, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3296, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3266, "src": "13973:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3299, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { 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"typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3321, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3252, "src": "14142:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3322, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "14142:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3325, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14142:26:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3258, "id": 3326, "nodeType": "Return", "src": "14135:33:5" } ] }, "documentation": "@notice Extracts the output at a given index in the TxIns vector\n @dev Iterates over the vout. If you need to extract multiple, write a custom function\n @param _vout The _vout to extract from\n @param _index The 0-indexed location of the output to extract\n @return The specified output", "id": 3328, "implemented": true, "kind": "function", "modifiers": [], "name": "extractOutputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 3255, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3252, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13628:18:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3251, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13628:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3254, "name": "_index", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13648:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3253, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "13648:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "src": "13627:34:5" }, "returnParameters": { "id": 3258, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3257, "name": "", "nodeType": "VariableDeclaration", "scope": 3328, "src": "13685:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3256, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13685:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "13684:14:5" }, "scope": 4082, "src": "13598:577:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3341, "nodeType": "Block", "src": "14485:43:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "38", "id": 3337, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14516:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, "value": "8" }, { "argumentTypes": null, "hexValue": "31", "id": 3338, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14519:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 3335, "name": "_output", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3330, "src": "14502:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3336, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "14502:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3339, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14502:19:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3334, "id": 3340, "nodeType": "Return", "src": "14495:26:5" } ] }, "documentation": "@notice Extracts the output script length\n @dev Indexes the length prefix on the pk_script\n @param _output The output\n @return The 1 byte length prefix", "id": 3342, "implemented": true, "kind": "function", "modifiers": [], "name": "extractOutputScriptLen", "nodeType": "FunctionDefinition", "parameters": { "id": 3331, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3330, "name": "_output", "nodeType": "VariableDeclaration", "scope": 3342, "src": "14426:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3329, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "14426:5:5", "typeDescriptions": { "typeIdentifier": 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"30", "id": 3351, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14877:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, { "argumentTypes": null, "hexValue": "38", "id": 3352, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14880:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, "value": "8" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" } ], "expression": { "argumentTypes": null, "id": 3349, "name": "_output", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3344, "src": "14863:7:5", 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"assignments": [ 3566 ], "declarations": [ { "constant": false, "id": 3566, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 3630, "src": "17937:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3565, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "17937:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3568, "initialValue": { "argumentTypes": null, "hexValue": "31", "id": 3567, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "17955:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "VariableDeclarationStatement", "src": "17937:19:5" }, { "assignments": [ 3570 ], "declarations": [ { 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"t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3603, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2929, "src": "18329:20:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3612, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "18329:64:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18318:75:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3614, "nodeType": "ExpressionStatement", "src": "18318:75:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3618, "isConstant": false, "isLValue": false, "isPure": 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memory" } }, "id": 3627, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "18625:11:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "18614:22:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3564, "id": 3629, "nodeType": "Return", "src": "18607:29:5" } ] }, "documentation": "@notice Checks that the vin passed up is properly formatted\n @dev Consider a vin with a valid vout in its scriptsig\n @param _vin Raw bytes length-prefixed input vector\n @return True if it represents a validly formatted vin", "id": 3631, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVin", "nodeType": "FunctionDefinition", "parameters": { "id": 3561, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3560, "name": "_vin", "nodeType": 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"17920:6:5" }, "scope": 4082, "src": "17858:785:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3703, "nodeType": "Block", "src": "18993:726:5", "statements": [ { "assignments": [ 3639 ], "declarations": [ { "constant": false, "id": 3639, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 3703, "src": "19003:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3638, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "19003:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3641, "initialValue": { "argumentTypes": null, "hexValue": "31", "id": 3640, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19021:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "VariableDeclarationStatement", "src": "19003:19:5" }, { "assignments": [ 3643 ], "declarations": [ { "constant": false, "id": 3643, "name": "_nOuts", "nodeType": "VariableDeclaration", "scope": 3703, "src": "19032:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3642, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "19032:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3653, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3647, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19065:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, { "argumentTypes": null, "hexValue": "31", "id": 3648, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19068:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 3645, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19053:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3646, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "19053:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3649, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "19053:17:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3651, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 3650, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19071:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": 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"argumentTypes": null, "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 3660, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3656, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3654, "name": "_nOuts", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3643, "src": "19153:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "argumentTypes": null, "hexValue": "30786664", "id": 3655, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19163:4:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_253_by_1", "typeString": "int_const 253" }, "value": "0xfd" }, "src": "19153:14:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3659, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3657, "name": "_nOuts", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3643, "src": "19171:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3658, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19181:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "19171:11:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "19153:29:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 3664, "nodeType": "IfStatement", "src": "19149:72:5", "trueBody": { "id": 3663, "nodeType": "Block", "src": "19184:37:5", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 3661, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "19205:5:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 3637, "id": 3662, "nodeType": "Return", "src": "19198:12:5" } ] } }, { "body": { "id": 3696, "nodeType": "Block", "src": "19266:349:5", "statements": [ { "expression": { "argumentTypes": 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"argumentTypes": null, "id": 3680, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19443:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3681, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "19443:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 3682, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3639, "src": "19458:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19443:22:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3677, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19422:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3678, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "19422:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3684, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "19422:44:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3676, "name": "determineOutputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3250, "src": "19400:21:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3685, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "19400:67:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19389:78:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3687, "nodeType": "ExpressionStatement", "src": "19389:78:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3691, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3688, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3639, "src": "19536:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3689, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19546:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3690, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "19546:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19536:22:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 3695, "nodeType": "IfStatement", "src": "19532:73:5", "trueBody": { "id": 3694, "nodeType": "Block", "src": "19560:45:5", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 3692, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "19585:5:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 3637, "id": 3693, "nodeType": "Return", "src": "19578:12:5" } ] } } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3671, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3669, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3666, "src": "19249:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 3670, "name": "_nOuts", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3643, "src": "19253:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "19249:10:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3697, "initializationExpression": { "assignments": [ 3666 ], "declarations": [ { "constant": false, "id": 3666, "name": "i", "nodeType": "VariableDeclaration", "scope": 3697, "src": "19236:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3665, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "19236:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3668, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 3667, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19246:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "19236:11:5" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 3673, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "19261:3:5", "subExpression": { "argumentTypes": null, "id": 3672, "name": "i", "nodeType": 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"_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3633, "src": "19700:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3700, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "19700:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19689:23:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3637, "id": 3702, "nodeType": "Return", "src": "19682:30:5" } ] }, "documentation": "@notice Checks that the vin passed up is properly formatted\n @dev Consider a vin with a valid vout in its scriptsig\n @param _vout Raw bytes length-prefixed output vector\n @return True if it represents a validly formatted bout", "id": 3704, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVout", "nodeType": "FunctionDefinition", "parameters": { "id": 3634, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3633, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 3704, "src": "18944:18:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3632, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "18944:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "18943:20:5" }, "returnParameters": { "id": 3637, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3636, "name": "", "nodeType": "VariableDeclaration", "scope": 3704, "src": "18987:4:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 3635, "name": "bool", "nodeType": "ElementaryTypeName", "src": "18987:4:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "18986:6:5" }, "scope": 4082, "src": "18922:797:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3717, "nodeType": "Block", "src": "20141:45:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 3713, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20172:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "hexValue": "3332", "id": 3714, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20176:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" }, "value": "32" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" } ], "expression": { "argumentTypes": null, "id": 3711, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3706, "src": "20158:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3712, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "20158:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3715, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20158:21:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3710, "id": 3716, "nodeType": "Return", "src": "20151:28:5" } ] }, "documentation": "@notice Extracts the transaction merkle root from a block header\n @dev Use verifyHash256Merkle to verify proofs with this root\n @param _header The header\n @return The merkle root (little-endian)", "id": 3718, "implemented": true, "kind": "function", "modifiers": [], "name": "extractMerkleRootLE", "nodeType": "FunctionDefinition", "parameters": { "id": 3707, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3706, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3718, "src": "20082:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3705, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20082:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20081:22:5" }, "returnParameters": { "id": 3710, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3709, "name": "", "nodeType": "VariableDeclaration", "scope": 3718, "src": "20127:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3708, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20127:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20126:14:5" }, "scope": 4082, "src": "20053:133:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3731, "nodeType": "Block", "src": "20533:71:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3727, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3720, "src": "20588:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3726, "name": "extractMerkleRootLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3718, "src": "20568:19:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3728, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20568:28:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3725, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "20550:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3729, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20550:47:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3724, "id": 3730, "nodeType": "Return", "src": "20543:54:5" } ] }, "documentation": "@notice Extracts the transaction merkle root from a block header\n @dev Use verifyHash256Merkle to verify proofs with this root\n @param _header The header\n @return The merkle root (big-endian)", "id": 3732, "implemented": true, "kind": "function", "modifiers": [], "name": "extractMerkleRootBE", "nodeType": "FunctionDefinition", "parameters": { "id": 3721, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3720, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3732, "src": "20474:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3719, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20474:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20473:22:5" }, "returnParameters": { "id": 3724, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3723, "name": "", "nodeType": "VariableDeclaration", "scope": 3732, "src": "20519:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3722, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20519:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20518:14:5" }, "scope": 4082, "src": "20445:159:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3776, "nodeType": "Block", "src": "20935:239:5", "statements": [ { "assignments": [ 3740 ], "declarations": [ { "constant": false, "id": 3740, "name": "_m", "nodeType": "VariableDeclaration", "scope": 3776, "src": "20945:15:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3739, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20945:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 3746, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3732", "id": 3743, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20977:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_72_by_1", "typeString": "int_const 72" }, "value": "72" }, { "argumentTypes": null, "hexValue": "33", "id": 3744, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "20981:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_3_by_1", "typeString": "int_const 3" }, "value": "3" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_72_by_1", "typeString": "int_const 72" }, { "typeIdentifier": "t_rational_3_by_1", "typeString": "int_const 3" } ], "expression": { "argumentTypes": null, "id": 3741, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3734, "src": "20963:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3742, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "20963:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3745, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20963:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "20945:38:5" }, { "assignments": [ 3748 ], "declarations": [ { "constant": false, "id": 3748, "name": "_e", "nodeType": "VariableDeclaration", "scope": 3776, "src": "20993:8:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 3747, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "20993:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 3754, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 3750, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3734, "src": "21010:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3752, "indexExpression": { "argumentTypes": null, "hexValue": "3735", "id": 3751, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21018:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_75_by_1", "typeString": "int_const 75" }, "value": "75" }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "21010:11:5", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 3749, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "21004:5:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 3753, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21004:18:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "20993:29:5" }, { "assignments": [ 3756 ], "declarations": [ { "constant": false, "id": 3756, "name": "_mantissa", "nodeType": "VariableDeclaration", "scope": 3776, "src": "21032:17:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3755, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21032:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3762, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3759, "name": "_m", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3740, "src": "21082:2:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3758, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "21064:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3760, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21064:21:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3757, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2726, "src": "21052:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3761, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21052:34:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "21032:54:5" }, { "assignments": [ 3764 ], "declarations": [ { "constant": false, "id": 3764, "name": "_exponent", "nodeType": "VariableDeclaration", "scope": 3776, "src": "21096:14:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3763, "name": "uint", "nodeType": "ElementaryTypeName", "src": "21096:4:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3768, "initialValue": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 3767, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3765, "name": "_e", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3748, "src": "21113:2:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "hexValue": "33", "id": 3766, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21118:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_3_by_1", "typeString": "int_const 3" }, "value": "3" }, "src": "21113:6:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "21096:23:5" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3774, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3769, "name": "_mantissa", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3756, "src": "21137:9:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3772, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "323536", "id": 3770, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "21150:3:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_256_by_1", "typeString": "int_const 256" }, "value": "256" }, "nodeType": "BinaryOperation", "operator": "**", "rightExpression": { "argumentTypes": null, "id": 3771, "name": "_exponent", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3764, "src": "21157:9:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "21150:16:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 3773, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "21149:18:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "21137:30:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3738, "id": 3775, "nodeType": "Return", "src": "21130:37:5" } ] }, "documentation": "@notice Extracts the target from a block header\n @dev Target is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n @param _header The header\n @return The target threshold", "id": 3777, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTarget", "nodeType": "FunctionDefinition", "parameters": { "id": 3735, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3734, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3777, "src": "20881:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3733, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20881:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20880:22:5" }, "returnParameters": { "id": 3738, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3737, "name": "", "nodeType": "VariableDeclaration", "scope": 3777, "src": "20926:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3736, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "20926:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "20925:9:5" }, "scope": 4082, "src": "20858:316:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3789, "nodeType": "Block", "src": "21632:100:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3786, "name": "_target", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3779, "src": "21717:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3784, "name": "DIFF1_TARGET", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2478, "src": "21700:12:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3785, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "div", "nodeType": "MemberAccess", "referencedDeclaration": 4319, "src": "21700:16:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 3787, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "21700:25:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3783, "id": 3788, "nodeType": "Return", "src": "21693:32:5" } ] }, "documentation": "@notice Calculate difficulty from the difficulty 1 target and current target\n @dev Difficulty 1 is 0x1d00ffff on mainnet and testnet\n @dev Difficulty 1 is a 256 bit number encoded as a 3-byte mantissa and 1 byte exponent\n @param _target The current target\n @return The block difficulty (bdiff)", "id": 3790, "implemented": true, "kind": "function", "modifiers": [], "name": "calculateDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 3780, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3779, "name": "_target", "nodeType": "VariableDeclaration", "scope": 3790, "src": "21583:15:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3778, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21583:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "21582:17:5" }, "returnParameters": { "id": 3783, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3782, "name": "", "nodeType": "VariableDeclaration", "scope": 3790, "src": "21623:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3781, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21623:7:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "21622:9:5" }, "scope": 4082, "src": "21554:178:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3803, "nodeType": "Block", "src": "22078:44:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "34", "id": 3799, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22109:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" }, { "argumentTypes": null, "hexValue": "3332", "id": 3800, "isConstant": false, "isLValue": false, "isPure": 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"t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3801, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22095:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3796, "id": 3802, "nodeType": "Return", "src": "22088:27:5" } ] }, "documentation": "@notice Extracts the previous block's hash from a block header\n @dev Block headers do NOT include block number :(\n @param _header The header\n @return The previous block's hash (little-endian)", "id": 3804, "implemented": true, "kind": "function", "modifiers": [], "name": "extractPrevBlockLE", "nodeType": "FunctionDefinition", "parameters": { "id": 3793, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3792, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3804, "src": "22019:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3791, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22019:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22018:22:5" }, "returnParameters": { "id": 3796, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3795, "name": "", "nodeType": "VariableDeclaration", "scope": 3804, "src": "22064:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3794, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22064:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22063:14:5" }, "scope": 4082, "src": "21991:131:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3817, "nodeType": "Block", "src": "22465:70:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3813, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3806, "src": "22519:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3812, "name": "extractPrevBlockLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3804, "src": "22500:18:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3814, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22500:27:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3811, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "22482:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3815, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22482:46:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3810, "id": 3816, "nodeType": "Return", "src": "22475:53:5" } ] }, "documentation": "@notice Extracts the previous block's hash from a block header\n @dev Block headers do NOT include block number :(\n @param _header The header\n @return The previous block's hash (big-endian)", "id": 3818, "implemented": true, "kind": "function", "modifiers": [], "name": "extractPrevBlockBE", "nodeType": "FunctionDefinition", "parameters": { "id": 3807, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3806, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3818, "src": "22406:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3805, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22406:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22405:22:5" }, "returnParameters": { "id": 3810, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3809, "name": "", "nodeType": "VariableDeclaration", "scope": 3818, "src": "22451:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3808, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22451:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22450:14:5" }, "scope": 4082, "src": "22378:157:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3831, "nodeType": "Block", "src": "22844:44:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3638", "id": 3827, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22875:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_68_by_1", "typeString": "int_const 68" }, "value": "68" }, { "argumentTypes": null, "hexValue": "34", "id": 3828, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "22879:1:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_68_by_1", "typeString": "int_const 68" }, { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" } ], "expression": { "argumentTypes": null, "id": 3825, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3820, "src": "22861:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 3826, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 4133, "src": "22861:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$_t_uint256_$returns$_t_bytes_memory_ptr_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 3829, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "22861:20:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 3824, "id": 3830, "nodeType": "Return", "src": "22854:27:5" } ] }, "documentation": "@notice Extracts the timestamp from a block header\n @dev Time is not 100% reliable\n @param _header The header\n @return The timestamp (little-endian bytes)", "id": 3832, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestampLE", "nodeType": "FunctionDefinition", "parameters": { "id": 3821, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3820, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3832, "src": "22785:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3819, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22785:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22784:22:5" }, "returnParameters": { "id": 3824, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3823, "name": "", "nodeType": "VariableDeclaration", "scope": 3832, "src": "22830:12:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3822, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22830:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22829:14:5" }, "scope": 4082, "src": "22757:131:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3849, "nodeType": "Block", "src": "23174:91:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3843, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3834, "src": "23247:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3842, "name": "extractTimestampLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3832, "src": "23228:18:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3844, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23228:27:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3841, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2579, "src": "23210:17:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 3845, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23210:46:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3840, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2726, "src": "23198:11:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3846, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23198:59:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3839, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "23191:6:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint32_$", "typeString": "type(uint32)" }, "typeName": "uint32" }, "id": 3847, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23191:67:5", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "functionReturnParameters": 3838, "id": 3848, "nodeType": "Return", "src": "23184:74:5" } ] }, "documentation": "@notice Extracts the timestamp from a block header\n @dev Time is not 100% reliable\n @param _header The header\n @return The timestamp (uint)", "id": 3850, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestamp", "nodeType": "FunctionDefinition", "parameters": { "id": 3835, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3834, "name": "_header", "nodeType": "VariableDeclaration", "scope": 3850, "src": "23121:20:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3833, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "23121:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "23120:22:5" }, "returnParameters": { "id": 3838, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3837, "name": "", "nodeType": "VariableDeclaration", "scope": 3850, "src": "23166:6:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" }, "typeName": { "id": 3836, "name": "uint32", "nodeType": "ElementaryTypeName", "src": "23166:6:5", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "value": null, "visibility": "internal" } ], "src": "23165:8:5" }, "scope": 4082, "src": "23095:170:5", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 3863, "nodeType": "Block", "src": "23570:67:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3859, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3852, "src": "23621:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3858, "name": "extractTarget", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3777, "src": "23607:13:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 3860, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23607:22:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3857, "name": "calculateDifficulty", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3790, "src": "23587:19:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$returns$_t_uint256_$", "typeString": "function (uint256) pure returns (uint256)" } }, "id": 3861, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "23587:43:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 3856, "id": 3862, "nodeType": "Return", "src": "23580:50:5" } ] }, "documentation": "@notice Extracts the expected difficulty from a block header\n @dev Does NOT verify the work\n @param _header The header\n @return The difficulty as an integer", "id": 3864, "implemented": true, "kind": "function", "modifiers": [], "name": "extractDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 3853, "nodeType": "ParameterList", 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