{ "contractName": "BTCUtils", "abi": [ { "constant": true, "inputs": [], "name": "DIFF1_TARGET", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "ERR_BAD_ARG", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "RETARGET_PERIOD", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "RETARGET_PERIOD_BLOCKS", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"constant\":true,\"inputs\":[],\"name\":\"DIFF1_TARGET\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ERR_BAD_ARG\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"RETARGET_PERIOD\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"RETARGET_PERIOD_BLOCKS\",\"outputs\":[{\"internalType\":\"uint256\",\"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\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol\":{\"keccak256\":\"0x461cc52e40ba53e646f5c9505b992baa3d5b3c98ae5718561e61b3bc6c726d52\",\"urls\":[\"bzz-raw://90cf2e608b660671642a616ec044e2a39e8ceb7079315b6133ec978c47af9f98\",\"dweb:/ipfs/QmX4hyYS99RYWiQ7BwLXuvQpU5x62YbjJWLgYFwrPkYbzT\"]},\"@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol\":{\"keccak256\":\"0x43451fdb4c4d55c01122411a4cf89a5c544c2bd4b646ee1d1f306626275324bf\",\"urls\":[\"bzz-raw://db93f07c32fa294d416aaab1b19a205772f2a3fa573fd380e5641e7770193ccf\",\"dweb:/ipfs/QmVE4y8cFKWZGKEfTM9Q3YreAArpMTTALHNr2tcvcNDnbi\"]},\"@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol\":{\"keccak256\":\"0x22d34c04c68c2a77ee83e2ef3756f6e6bad6ad675560d777e612315d7eb83935\",\"urls\":[\"bzz-raw://b642c61be1d34e153e4f9cc139291fa26f4ecf31a3acc5b960aad20f4f689eeb\",\"dweb:/ipfs/QmWADdVTCSyvtgb76AxFFkAr9h9jbY57Mj5X6xiEqCqmMu\"]}},\"version\":1}", "bytecode": "0x60d1610025600b82828239805160001a60731461001857fe5b30600052607381538281f3fe730000000000000000000000000000000000000000301460806040526004361060515760003560e01c8063056e04ec1460565780638cc7156914606e5780638db69e60146074578063d4258ca714607a575b600080fd5b605c6080565b60408051918252519081900360200190f35b605c6087565b605c608d565b605c6093565b6212750081565b6107e081565b60001981565b61ffff60d01b8156fea265627a7a72315820c698b384a60d7308692167697814c7f3554f9856ad77f463574a495cd8e3124864736f6c63430005110032", "deployedBytecode": "0x730000000000000000000000000000000000000000301460806040526004361060515760003560e01c8063056e04ec1460565780638cc7156914606e5780638db69e60146074578063d4258ca714607a575b600080fd5b605c6080565b60408051918252519081900360200190f35b605c6087565b605c608d565b605c6093565b6212750081565b6107e081565b60001981565b61ffff60d01b8156fea265627a7a72315820c698b384a60d7308692167697814c7f3554f9856ad77f463574a495cd8e3124864736f6c63430005110032", "sourceMap": "176:28301:48:-;;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": "176:28301:48:-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;444:62;;;:::i;:::-;;;;;;;;;;;;;;;;535:53;;;:::i;617:104::-;;;:::i;340:97::-;;;:::i;444:62::-;486:20;444:62;:::o;535:53::-;584:4;535:53;:::o;617:104::-;-1:-1:-1;;617:104:48;:::o;340:97::-;-1:-1:-1;;;340:97:48;:::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 uint256 public constant ERR_BAD_ARG = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;\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 Parse a VarInt into its data length and the number it represents\n /// @dev Useful for Parsing Vins and Vouts. Returns ERR_BAD_ARG if insufficient bytes.\n /// Caller SHOULD explicitly handle this case (or bubble it up)\n /// @param _b A byte-string starting with a VarInt\n /// @return number of bytes in the encoding (not counting the tag), the encoded int\n function parseVarInt(bytes memory _b) internal pure returns (uint256, uint256) {\n uint8 _dataLen = determineVarIntDataLength(_b);\n\n if (_dataLen == 0) {\n return (0, uint8(_b[0]));\n }\n if (_b.length < 1 + _dataLen) {\n return (ERR_BAD_ARG, 0);\n }\n uint256 _number = bytesToUint(reverseEndianness(_b.slice(1, _dataLen)));\n return (_dataLen, _number);\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 sha256(abi.encodePacked(sha256(_b)));\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 // solium-disable-next-line security/no-inline-assembly\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, uint256 _index) internal pure returns (bytes memory) {\n uint256 _varIntDataLen;\n uint256 _nIns;\n\n (_varIntDataLen, _nIns) = parseVarInt(_vin);\n require(_varIntDataLen != ERR_BAD_ARG, \"Read overrun during VarInt parsing\");\n require(_index < _nIns, \"Vin read overrun\");\n\n bytes memory _remaining;\n\n uint256 _len = 0;\n uint256 _offset = 1 + _varIntDataLen;\n\n for (uint256 _i = 0; _i < _index; _i ++) {\n _remaining = _vin.slice(_offset, _vin.length - _offset);\n _len = determineInputLength(_remaining);\n require(_len != ERR_BAD_ARG, \"Bad VarInt in scriptSig\");\n _offset = _offset + _len;\n }\n\n _remaining = _vin.slice(_offset, _vin.length - _offset);\n _len = determineInputLength(_remaining);\n require(_len != ERR_BAD_ARG, \"Bad VarInt in scriptSig\");\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 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 (uint256, uint256) {\n if (_input.length < 37) {\n return (ERR_BAD_ARG, 0);\n }\n bytes memory _afterOutpoint = _input.slice(36, _input.length - 36);\n\n uint256 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = parseVarInt(_afterOutpoint);\n\n return (_varIntDataLen, _scriptSigLen);\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 uint256 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n if (_varIntDataLen == ERR_BAD_ARG) {\n return ERR_BAD_ARG;\n }\n\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 uint256 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n require(_varIntDataLen != ERR_BAD_ARG, \"Bad VarInt in scriptSig\");\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 scriptSig\n function extractScriptSig(bytes memory _input) internal pure returns (bytes memory) {\n uint256 _varIntDataLen;\n uint256 _scriptSigLen;\n (_varIntDataLen, _scriptSigLen) = extractScriptSigLen(_input);\n require(_varIntDataLen != ERR_BAD_ARG, \"Bad VarInt in scriptSig\");\n return _input.slice(36, 1 + _varIntDataLen + _scriptSigLen);\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 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 /* ****** */\n /* Output */\n /* ****** */\n\n /// @notice Determines the length of an output\n /// @dev Works with any properly formatted output\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 if (_output.length < 9) {\n return ERR_BAD_ARG;\n }\n bytes memory _afterValue = _output.slice(8, _output.length - 8);\n\n uint256 _varIntDataLen;\n uint256 _scriptPubkeyLength;\n (_varIntDataLen, _scriptPubkeyLength) = parseVarInt(_afterValue);\n\n if (_varIntDataLen == ERR_BAD_ARG) {\n return ERR_BAD_ARG;\n }\n\n // 8-byte value, 1-byte for tag itself\n return 8 + 1 + _varIntDataLen + _scriptPubkeyLength;\n }\n\n /// @notice Extracts the output at a given index in the TxOuts 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, uint256 _index) internal pure returns (bytes memory) {\n uint256 _varIntDataLen;\n uint256 _nOuts;\n\n (_varIntDataLen, _nOuts) = parseVarInt(_vout);\n require(_varIntDataLen != ERR_BAD_ARG, \"Read overrun during VarInt parsing\");\n require(_index < _nOuts, \"Vout read overrun\");\n\n bytes memory _remaining;\n\n uint256 _len = 0;\n uint256 _offset = 1 + _varIntDataLen;\n\n for (uint256 _i = 0; _i < _index; _i ++) {\n _remaining = _vout.slice(_offset, _vout.length - _offset);\n _len = determineOutputLength(_remaining);\n require(_len != ERR_BAD_ARG, \"Bad VarInt in scriptPubkey\");\n _offset += _len;\n }\n\n _remaining = _vout.slice(_offset, _vout.length - _offset);\n _len = determineOutputLength(_remaining);\n require(_len != ERR_BAD_ARG, \"Bad VarInt in scriptPubkey\");\n return _vout.slice(_offset, _len);\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 uint8 _scriptLen = uint8(_output[8]);\n\n // don't have to worry about overflow here.\n // if _scriptLen + 9 overflows, then output.length would have to be < 9\n // for this check to pass. if it's < 9, then we errored when assigning\n // _scriptLen\n if (_scriptLen + 9 != _output.length) {\n return hex\"\";\n }\n\n if (uint8(_output[9]) == 0) {\n if (_scriptLen < 2) {\n return hex\"\";\n }\n uint256 _payloadLen = uint8(_output[10]);\n // Check for maliciously formatted witness outputs.\n // No need to worry about underflow as long b/c of the `< 2` check\n if (_payloadLen != _scriptLen - 2 || (_payloadLen != 0x20 && _payloadLen != 0x14)) {\n return hex\"\";\n }\n return _output.slice(11, _payloadLen);\n } else {\n bytes32 _tag = _output.keccak256Slice(8, 3);\n // p2pkh\n if (_tag == keccak256(hex\"1976a9\")) {\n // Check for maliciously formatted p2pkh\n // No need to worry about underflow, b/c of _scriptLen check\n if (uint8(_output[11]) != 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 // No need to worry about underflow, b/c of _scriptLen check\n if (uint8(_output[_output.length - 1]) != 0x87) {\n return hex\"\";\n }\n return _output.slice(11, 20);\n }\n }\n return hex\"\"; /* NB: will trigger on OPRETURN and any non-standard that doesn'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 _varIntDataLen;\n uint256 _nIns;\n\n (_varIntDataLen, _nIns) = parseVarInt(_vin);\n\n // Not valid if it says there are too many or no inputs\n if (_nIns == 0 || _varIntDataLen == ERR_BAD_ARG) {\n return false;\n }\n\n uint256 _offset = 1 + _varIntDataLen;\n\n for (uint256 i = 0; i < _nIns; i++) {\n // If we're at the end, but still expect more\n if (_offset >= _vin.length) {\n return false;\n }\n\n // Grab the next input and determine its length.\n bytes memory _next = _vin.slice(_offset, _vin.length - _offset);\n uint256 _nextLen = determineInputLength(_next);\n if (_nextLen == ERR_BAD_ARG) {\n return false;\n }\n\n // Increase the offset by that much\n _offset += _nextLen;\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 vout passed up is properly formatted\n /// @dev Consider a vout with a valid scriptpubkey\n /// @param _vout Raw bytes length-prefixed output vector\n /// @return True if it represents a validly formatted vout\n function validateVout(bytes memory _vout) internal pure returns (bool) {\n uint256 _varIntDataLen;\n uint256 _nOuts;\n\n (_varIntDataLen, _nOuts) = parseVarInt(_vout);\n\n // Not valid if it says there are too many or no outputs\n if (_nOuts == 0 || _varIntDataLen == ERR_BAD_ARG) {\n return false;\n }\n\n uint256 _offset = 1 + _varIntDataLen;\n\n for (uint256 i = 0; i < _nOuts; i++) {\n // If we're at the end, but still expect more\n if (_offset >= _vout.length) {\n return false;\n }\n\n // Grab the next output and determine its length.\n // Increase the offset by that much\n bytes memory _next = _vout.slice(_offset, _vout.length - _offset);\n uint256 _nextLen = determineOutputLength(_next);\n if (_nextLen == ERR_BAD_ARG) {\n return false;\n }\n\n _offset += _nextLen;\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 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 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": [ 13216 ] }, "id": 13217, "nodeType": "SourceUnit", "nodes": [ { "id": 11469, "literals": [ "solidity", "^", "0.5", ".10" ], "nodeType": "PragmaDirective", "src": "0:24:48" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol", "file": "./BytesLib.sol", "id": 11471, "nodeType": "ImportDirective", "scope": 13217, "sourceUnit": 13433, "src": "93:40:48", "symbolAliases": [ { "foreign": 11470, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol", "file": "./SafeMath.sol", "id": 11473, "nodeType": "ImportDirective", "scope": 13217, "sourceUnit": 13922, "src": "134:40:48", "symbolAliases": [ { "foreign": 11472, "local": null } ], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": null, "fullyImplemented": true, "id": 13216, "linearizedBaseContracts": [ 13216 ], "name": "BTCUtils", "nodeType": "ContractDefinition", "nodes": [ { "id": 11476, "libraryName": { "contractScope": null, "id": 11474, "name": "BytesLib", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13432, "src": "205:8:48", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesLib_$13432", "typeString": "library BytesLib" } }, "nodeType": "UsingForDirective", "src": "199:25:48", "typeName": { "id": 11475, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "218:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "id": 11479, "libraryName": { "contractScope": null, "id": 11477, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13921, "src": "235:8:48", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$13921", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "229:27:48", "typeName": { "id": 11478, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "248:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "constant": true, "id": 11482, "name": "DIFF1_TARGET", "nodeType": "VariableDeclaration", "scope": 13216, "src": "340:97:48", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11480, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "340:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "hexValue": "30786666666630303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030", "id": 11481, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "379:58:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_26959535291011309493156476344723991336010898738574164086137773096960_by_1", "typeString": "int_const 2695...(60 digits omitted)...6960" }, "value": "0xffff0000000000000000000000000000000000000000000000000000" }, "visibility": "public" }, { "constant": true, "id": 11493, "name": "RETARGET_PERIOD", "nodeType": "VariableDeclaration", "scope": 13216, "src": "444:62:48", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11483, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "444:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_1209600_by_1", "typeString": "int_const 1209600" }, "id": 11492, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_20160_by_1", "typeString": "int_const 20160" }, "id": 11490, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_336_by_1", "typeString": "int_const 336" }, "id": 11488, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_14_by_1", "typeString": "int_const 14" }, "id": 11486, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "32", "id": 11484, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "486:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2_by_1", "typeString": "int_const 2" }, "value": "2" }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "hexValue": "37", "id": 11485, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "490:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_7_by_1", "typeString": "int_const 7" }, "value": "7" }, "src": "486:5:48", "typeDescriptions": { "typeIdentifier": "t_rational_14_by_1", "typeString": "int_const 14" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "hexValue": "3234", "id": 11487, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "494:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_24_by_1", "typeString": "int_const 24" }, "value": "24" }, "src": "486:10:48", "typeDescriptions": { "typeIdentifier": "t_rational_336_by_1", "typeString": "int_const 336" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "hexValue": "3630", "id": 11489, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "499:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_60_by_1", "typeString": "int_const 60" }, "value": "60" }, "src": "486:15:48", "typeDescriptions": { "typeIdentifier": "t_rational_20160_by_1", "typeString": "int_const 20160" } }, "nodeType": "BinaryOperation", "operator": "*", "rightExpression": { "argumentTypes": null, "hexValue": "3630", "id": 11491, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "504:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_60_by_1", "typeString": "int_const 60" }, "value": "60" }, "src": "486:20:48", "typeDescriptions": { "typeIdentifier": "t_rational_1209600_by_1", "typeString": "int_const 1209600" } }, "visibility": "public" }, { "constant": true, "id": 11496, "name": "RETARGET_PERIOD_BLOCKS", "nodeType": "VariableDeclaration", "scope": 13216, "src": "535:53:48", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11494, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "535:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "hexValue": "32303136", "id": 11495, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "584:4:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2016_by_1", "typeString": "int_const 2016" }, "value": "2016" }, "visibility": "public" }, { "constant": true, "id": 11499, "name": "ERR_BAD_ARG", "nodeType": "VariableDeclaration", "scope": 13216, "src": "617:104:48", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11497, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "617:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": { "argumentTypes": null, "hexValue": "307866666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666", "id": 11498, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "655:66:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_115792089237316195423570985008687907853269984665640564039457584007913129639935_by_1", "typeString": "int_const 1157...(70 digits omitted)...9935" }, "value": "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" }, "visibility": "public" }, { "body": { "id": 11541, "nodeType": "Block", "src": "1137:352:48", "statements": [ { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 11512, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 11507, "name": "_flag", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11501, "src": "1157:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11509, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 11508, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1163:1:48", "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": "1157:8:48", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 11506, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1151:5:48", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 11510, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1151:15:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30786666", "id": 11511, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1170:4:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_255_by_1", "typeString": "int_const 255" }, "value": "0xff" }, "src": "1151:23:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 11516, "nodeType": "IfStatement", "src": "1147:94:48", "trueBody": { "id": 11515, "nodeType": "Block", "src": "1176:65:48", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "38", "id": 11513, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1197:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" }, "value": "8" }, "functionReturnParameters": 11505, "id": 11514, "nodeType": "Return", "src": "1190:8:48" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 11523, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 11518, "name": "_flag", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11501, "src": "1260:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11520, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 11519, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1266:1:48", "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": "1260:8:48", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 11517, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1254:5:48", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 11521, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1254:15:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30786665", "id": 11522, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1273:4:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_254_by_1", "typeString": "int_const 254" }, "value": "0xfe" }, "src": "1254:23:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 11527, "nodeType": "IfStatement", "src": "1250:94:48", "trueBody": { "id": 11526, "nodeType": "Block", "src": "1279:65:48", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "34", "id": 11524, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1300:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" }, "functionReturnParameters": 11505, "id": 11525, "nodeType": "Return", "src": "1293:8:48" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 11534, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 11529, "name": "_flag", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11501, "src": "1363:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11531, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 11530, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1369:1:48", "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": "1363:8:48", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 11528, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1357:5:48", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 11532, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1357:15:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30786664", "id": 11533, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1376:4:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_253_by_1", "typeString": "int_const 253" }, "value": "0xfd" }, "src": "1357:23:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 11538, "nodeType": "IfStatement", "src": "1353:94:48", "trueBody": { "id": 11537, "nodeType": "Block", "src": "1382:65:48", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "32", "id": 11535, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1403:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2_by_1", "typeString": "int_const 2" }, "value": "2" }, "functionReturnParameters": 11505, "id": 11536, "nodeType": "Return", "src": "1396:8:48" } ] } }, { "expression": { "argumentTypes": null, "hexValue": "30", "id": 11539, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1464:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "functionReturnParameters": 11505, "id": 11540, "nodeType": "Return", "src": "1457:8:48" } ] }, "documentation": "@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", "id": 11542, "implemented": true, "kind": "function", "modifiers": [], "name": "determineVarIntDataLength", "nodeType": "FunctionDefinition", "parameters": { "id": 11502, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11501, "name": "_flag", "nodeType": "VariableDeclaration", "scope": 11542, "src": "1087:18:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11500, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1087:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "1086:20:48" }, "returnParameters": { "id": 11505, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11504, "name": "", "nodeType": "VariableDeclaration", "scope": 11542, "src": "1130:5:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 11503, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "1130:5:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "src": "1129:7:48" }, "scope": 13216, "src": "1052:437:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 11598, "nodeType": "Block", "src": "1986:345:48", "statements": [ { "assignments": [ 11552 ], "declarations": [ { "constant": false, "id": 11552, "name": "_dataLen", "nodeType": "VariableDeclaration", "scope": 11598, "src": "1996:14:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 11551, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "1996:5:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 11556, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11554, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11544, "src": "2039:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11553, "name": "determineVarIntDataLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11542, "src": "2013:25:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint8_$", "typeString": "function (bytes memory) pure returns (uint8)" } }, "id": 11555, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2013:29:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "1996:46:48" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 11559, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11557, "name": "_dataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11552, "src": "2057:8:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 11558, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2069:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "2057:13:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 11569, "nodeType": "IfStatement", "src": "2053:68:48", "trueBody": { "id": 11568, "nodeType": "Block", "src": "2072:49:48", "statements": [ { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "hexValue": "30", "id": 11560, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2094:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 11562, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11544, "src": "2103:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11564, "indexExpression": { "argumentTypes": null, "hexValue": "30", "id": 11563, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2106:1:48", "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": "2103:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes1", "typeString": "bytes1" } ], "id": 11561, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2097:5:48", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint8_$", "typeString": "type(uint8)" }, "typeName": "uint8" }, "id": 11565, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2097:12:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } } ], "id": 11566, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2093:17:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_rational_0_by_1_$_t_uint8_$", "typeString": "tuple(int_const 0,uint8)" } }, "functionReturnParameters": 11550, "id": 11567, "nodeType": "Return", "src": "2086:24:48" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11575, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 11570, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11544, "src": "2134:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11571, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2134:9:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 11574, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "31", "id": 11572, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2146:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 11573, "name": "_dataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11552, "src": "2150:8:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "2146:12:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "src": "2134:24:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 11581, "nodeType": "IfStatement", "src": "2130:78:48", "trueBody": { "id": 11580, "nodeType": "Block", "src": "2160:48:48", "statements": [ { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 11576, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "2182:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "30", "id": 11577, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2195:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "id": 11578, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2181:16:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_rational_0_by_1_$", "typeString": "tuple(uint256,int_const 0)" } }, "functionReturnParameters": 11550, "id": 11579, "nodeType": "Return", "src": "2174:23:48" } ] } }, { "assignments": [ 11583 ], "declarations": [ { "constant": false, "id": 11583, "name": "_number", "nodeType": "VariableDeclaration", "scope": 11598, "src": "2217:15:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11582, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2217:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11593, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "31", "id": 11588, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2274:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, { "argumentTypes": null, "id": 11589, "name": "_dataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11552, "src": "2277:8:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, { "typeIdentifier": "t_uint8", "typeString": "uint8" } ], "expression": { "argumentTypes": null, "id": 11586, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11544, "src": "2265:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11587, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "2265:8:48", "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_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 11590, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2265:21:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11585, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11643, "src": "2247:17:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 11591, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2247:40:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11584, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11790, "src": "2235:11:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 11592, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2235:53:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2217:71:48" }, { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 11594, "name": "_dataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11552, "src": "2306:8:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, { "argumentTypes": null, "id": 11595, "name": "_number", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11583, "src": "2316:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 11596, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "2305:19:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint8_$_t_uint256_$", "typeString": "tuple(uint8,uint256)" } }, "functionReturnParameters": 11550, "id": 11597, "nodeType": "Return", "src": "2298:26:48" } ] }, "documentation": "@notice Parse a VarInt into its data length and the number it represents\n @dev Useful for Parsing Vins and Vouts. Returns ERR_BAD_ARG if insufficient bytes.\n Caller SHOULD explicitly handle this case (or bubble it up)\n @param _b A byte-string starting with a VarInt\n @return number of bytes in the encoding (not counting the tag), the encoded int", "id": 11599, "implemented": true, "kind": "function", "modifiers": [], "name": "parseVarInt", "nodeType": "FunctionDefinition", "parameters": { "id": 11545, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11544, "name": "_b", "nodeType": "VariableDeclaration", "scope": 11599, "src": "1928:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11543, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1928:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "1927:17:48" }, "returnParameters": { "id": 11550, 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} } ], "id": 11734, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "4115:10:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "4102:23:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "4098:27:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11737, "nodeType": "ExpressionStatement", "src": "4098:27:48" } ] }, "documentation": "@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", "id": 11739, "implemented": true, "kind": "function", "modifiers": [], "name": "reverseUint256", "nodeType": "FunctionDefinition", "parameters": { "id": 11646, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11645, 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"overloadedDeclarations": [], "referencedDeclaration": 18347, "src": "5401:3:48", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 11822, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "5401:16:48", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 11831, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5401:57:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 11820, "id": 11832, "nodeType": "Return", "src": "5394:64:48" } ] }, "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": 11834, "implemented": true, "kind": "function", "modifiers": [], "name": "hash160", "nodeType": "FunctionDefinition", "parameters": { "id": 11817, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11816, "name": "_b", "nodeType": "VariableDeclaration", "scope": 11834, "src": "5330:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11815, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5330:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5329:17:48" }, "returnParameters": { "id": 11820, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11819, "name": "", "nodeType": "VariableDeclaration", "scope": 11834, "src": "5370:12:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11818, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5370:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5369:14:48" }, "scope": 13216, "src": "5313:152:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 11850, "nodeType": "Block", "src": "5769:60:48", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11845, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11836, "src": "5817:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11844, "name": "sha256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 18369, "src": "5810:6:48", "typeDescriptions": { "typeIdentifier": "t_function_sha256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 11846, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5810:10:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "expression": { "argumentTypes": null, "id": 11842, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 18347, "src": "5793:3:48", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 11843, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "5793:16:48", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 11847, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5793:28:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11841, "name": "sha256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 18369, "src": "5786:6:48", "typeDescriptions": { "typeIdentifier": "t_function_sha256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 11848, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5786:36:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 11840, "id": 11849, "nodeType": "Return", "src": "5779:43:48" } ] }, "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": 11851, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256", "nodeType": "FunctionDefinition", "parameters": { "id": 11837, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11836, "name": "_b", "nodeType": "VariableDeclaration", "scope": 11851, "src": "5720:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11835, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5720:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5719:17:48" }, "returnParameters": { "id": 11840, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11839, "name": "", "nodeType": "VariableDeclaration", "scope": 11851, "src": "5760:7:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 11838, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "5760:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "5759:9:48" }, "scope": 13216, "src": "5703:126:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 11859, "nodeType": "Block", "src": "6134:288:48", "statements": [ { "externalReferences": [ { "_b": { "declaration": 11853, "isOffset": false, "isSlot": false, "src": "6293:2:48", "valueSize": 1 } }, { "res": { "declaration": 11856, "isOffset": false, "isSlot": false, "src": "6389:3:48", "valueSize": 1 } }, { "_b": { "declaration": 11853, "isOffset": false, "isSlot": false, "src": "6308:2:48", "valueSize": 1 } } ], "id": 11858, "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": "6208:208:48" } ] }, "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": 11860, "implemented": true, "kind": "function", "modifiers": [], "name": "hash256View", "nodeType": "FunctionDefinition", "parameters": { "id": 11854, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11853, "name": "_b", "nodeType": "VariableDeclaration", "scope": 11860, "src": "6081:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11852, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6081:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "6080:17:48" }, "returnParameters": { "id": 11857, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11856, "name": "res", "nodeType": "VariableDeclaration", "scope": 11860, "src": "6121:11:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 11855, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "6121:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "6120:13:48" }, "scope": 13216, "src": "6060:362:48", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 11982, "nodeType": "Block", "src": "6963:875:48", "statements": [ { "assignments": [ 11870 ], "declarations": [ { "constant": false, "id": 11870, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 11982, "src": "6973:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11869, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6973:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11871, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "6973:22:48" }, { "assignments": [ 11873 ], "declarations": [ { "constant": false, "id": 11873, "name": "_nIns", "nodeType": "VariableDeclaration", "scope": 11982, "src": "7005:13:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11872, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7005:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11874, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "7005:13:48" }, { "expression": { "argumentTypes": null, "id": 11881, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "components": 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[], "referencedDeclaration": 11862, "src": "7067:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11878, "name": "parseVarInt", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11599, "src": "7055:11:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256,uint256)" } }, "id": 11880, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7055:17:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "src": "7029:43:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11882, "nodeType": "ExpressionStatement", "src": "7029:43:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11886, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11884, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11870, "src": "7090:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 11885, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "7108:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7090:29:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "52656164206f76657272756e20647572696e6720566172496e742070617273696e67", "id": 11887, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7121:36:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_44f1d85595cd9e7bca9d9a2d6049b01f75f753890836287504890b72b66f7afd", "typeString": "literal_string \"Read overrun during VarInt parsing\"" }, "value": "Read overrun during VarInt parsing" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_44f1d85595cd9e7bca9d9a2d6049b01f75f753890836287504890b72b66f7afd", "typeString": "literal_string \"Read overrun during VarInt parsing\"" } ], "id": 11883, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "7082:7:48", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 11888, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7082:76:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11889, "nodeType": "ExpressionStatement", "src": "7082:76:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11893, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11891, "name": "_index", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11864, "src": "7176:6:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 11892, "name": "_nIns", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11873, "src": "7185:5:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7176:14:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "56696e2072656164206f76657272756e", "id": 11894, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7192:18:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_a957e9d3071160b28fdf54b241ef5554d7ebf4457632e38cd7ec08cd05aece4f", "typeString": "literal_string \"Vin read overrun\"" }, "value": "Vin read overrun" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_a957e9d3071160b28fdf54b241ef5554d7ebf4457632e38cd7ec08cd05aece4f", "typeString": "literal_string \"Vin read overrun\"" } ], "id": 11890, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "7168:7:48", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 11895, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7168:43:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11896, "nodeType": "ExpressionStatement", "src": "7168:43:48" }, { "assignments": [ 11898 ], "declarations": [ { "constant": false, "id": 11898, "name": "_remaining", "nodeType": "VariableDeclaration", "scope": 11982, "src": "7222:23:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11897, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "7222:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 11899, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "7222:23:48" }, { "assignments": [ 11901 ], "declarations": [ { "constant": false, "id": 11901, "name": "_len", "nodeType": "VariableDeclaration", "scope": 11982, "src": "7256:12:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11900, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7256:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11903, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 11902, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7271:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "7256:16:48" }, { "assignments": [ 11905 ], "declarations": [ { "constant": false, "id": 11905, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 11982, "src": "7282:15:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11904, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7282:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11909, "initialValue": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11908, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "31", "id": 11906, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7300:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 11907, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11870, "src": "7304:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7300:18:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "7282:36:48" }, { "body": { "id": 11950, "nodeType": "Block", "src": "7370:240:48", "statements": [ { "expression": { "argumentTypes": null, "id": 11929, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 11920, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11898, "src": "7384:10:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11923, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7408:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11927, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 11924, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11862, "src": "7417:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11925, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "7417:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 11926, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7431:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7417:21:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 11921, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11862, "src": "7397:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11922, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "7397:10:48", "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": 11928, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7397:42:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "7384:55:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11930, "nodeType": "ExpressionStatement", "src": "7384:55:48" }, { "expression": { "argumentTypes": null, "id": 11935, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 11931, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7453:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11933, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11898, "src": "7481:10:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11932, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12089, "src": "7460:20:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 11934, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7460:32:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7453:39:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11936, "nodeType": "ExpressionStatement", "src": "7453:39:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11940, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11938, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7514:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 11939, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "7522:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7514:19:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "42616420566172496e7420696e20736372697074536967", "id": 11941, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7535:25:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" }, "value": "Bad VarInt in scriptSig" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" } ], "id": 11937, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "7506:7:48", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 11942, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7506:55:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11943, "nodeType": "ExpressionStatement", "src": "7506:55:48" }, { "expression": { "argumentTypes": null, "id": 11948, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 11944, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7575:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11947, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11945, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7585:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 11946, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7595:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7585:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7575:24:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11949, "nodeType": "ExpressionStatement", "src": "7575:24:48" } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11916, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11914, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11911, "src": "7350:2:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 11915, "name": "_index", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11864, "src": "7355:6:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7350:11:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 11951, "initializationExpression": { "assignments": [ 11911 ], "declarations": [ { "constant": false, "id": 11911, "name": "_i", "nodeType": "VariableDeclaration", "scope": 11951, "src": "7334:10:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11910, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7334:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 11913, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 11912, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7347:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "7334:14:48" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 11918, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "++", "prefix": false, "src": "7363:5:48", "subExpression": { "argumentTypes": null, "id": 11917, "name": "_i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11911, "src": "7363:2:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11919, "nodeType": "ExpressionStatement", "src": "7363:5:48" }, "nodeType": "ForStatement", "src": "7329:281:48" }, { "expression": { "argumentTypes": null, "id": 11961, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 11952, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11898, "src": "7620:10:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11955, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7644:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11959, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 11956, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11862, "src": "7653:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11957, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "7653:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 11958, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7667:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7653:21:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 11953, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11862, "src": "7633:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11954, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "7633:10:48", "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_$", "typeString": "function (bytes memory,uint256,uint256) pure returns (bytes memory)" } }, "id": 11960, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7633:42:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "src": "7620:55:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11962, "nodeType": "ExpressionStatement", "src": "7620:55:48" }, { "expression": { "argumentTypes": null, "id": 11967, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 11963, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7685:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11965, "name": "_remaining", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11898, "src": "7713:10:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 11964, "name": "determineInputLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12089, "src": "7692:20:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 11966, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7692:32:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7685:39:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11968, "nodeType": "ExpressionStatement", "src": "7685:39:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11972, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 11970, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7742:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 11971, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "7750:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7742:19:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "42616420566172496e7420696e20736372697074536967", "id": 11973, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7763:25:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" }, "value": "Bad VarInt in scriptSig" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" } ], "id": 11969, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "7734:7:48", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 11974, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7734:55:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11975, "nodeType": "ExpressionStatement", "src": "7734:55:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 11978, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11905, "src": "7817:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 11979, "name": "_len", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11901, "src": "7826:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 11976, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11862, "src": "7806:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11977, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "7806:10:48", "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": 11980, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7806:25:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 11868, "id": 11981, "nodeType": "Return", "src": "7799:32:48" } ] }, "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": 11983, "implemented": true, "kind": "function", "modifiers": [], "name": "extractInputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 11865, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11862, "name": "_vin", "nodeType": "VariableDeclaration", "scope": 11983, "src": "6891:17:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11861, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6891:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 11864, "name": "_index", "nodeType": "VariableDeclaration", "scope": 11983, "src": "6910:14:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11863, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6910:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "6890:35:48" }, "returnParameters": { "id": 11868, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11867, "name": "", "nodeType": "VariableDeclaration", "scope": 11983, "src": "6949:12:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11866, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6949:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "6948:14:48" }, "scope": 13216, "src": "6862:976:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12000, "nodeType": "Block", "src": "8138:74:48", "statements": [ { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 11998, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 11992, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8177:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "hexValue": "31", "id": 11993, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8181:1:48", "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": 11990, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11985, "src": "8155:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 11991, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "keccak256Slice", "nodeType": "MemberAccess", "referencedDeclaration": 13431, "src": "8155:21:48", "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": 11994, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8155:28:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "00", "id": 11996, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "8197:7:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" }, "value": "\u0000" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_bc36789e7a1e281436464229828f817d6612f7b477d66591ff96a9e064bcc98a", "typeString": "literal_string \"\u0000\"" } ], "id": 11995, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 18354, "src": "8187:9:48", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 11997, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8187:18:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "8155:50:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 11989, "id": 11999, "nodeType": "Return", "src": "8148:57:48" } ] }, "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": 12001, "implemented": true, "kind": "function", "modifiers": [], "name": "isLegacyInput", "nodeType": "FunctionDefinition", "parameters": { "id": 11986, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11985, "name": "_input", "nodeType": "VariableDeclaration", "scope": 12001, "src": "8088:19:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 11984, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "8088:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "8087:21:48" }, "returnParameters": { "id": 11989, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11988, "name": "", "nodeType": "VariableDeclaration", "scope": 12001, "src": "8132:4:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 11987, "name": "bool", "nodeType": "ElementaryTypeName", "src": "8132:4:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "8131:6:48" }, "scope": 13216, "src": "8065:147:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12049, "nodeType": "Block", "src": "8545:348:48", "statements": [ { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12013, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 12010, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12003, "src": "8559:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12011, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "8559:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "hexValue": "3337", "id": 12012, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8575:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, "value": "37" }, "src": "8559:18:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 12019, "nodeType": "IfStatement", "src": "8555:72:48", "trueBody": { "id": 12018, "nodeType": "Block", "src": "8579:48:48", "statements": [ { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 12014, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "8601:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "30", "id": 12015, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8614:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "id": 12016, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "8600:16:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_rational_0_by_1_$", "typeString": "tuple(uint256,int_const 0)" } }, "functionReturnParameters": 12009, "id": 12017, "nodeType": "Return", "src": "8593:23:48" } ] } }, { "assignments": [ 12021 ], "declarations": [ { "constant": false, "id": 12021, "name": "_afterOutpoint", "nodeType": "VariableDeclaration", "scope": 12049, "src": "8636:27:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12020, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "8636:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 12030, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3336", "id": 12024, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8679:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12028, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 12025, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12003, "src": "8683:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12026, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "8683:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "hexValue": "3336", "id": 12027, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8699:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, "src": "8683:18:48", "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": 12022, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12003, "src": "8666:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12023, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "8666:12:48", "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": 12029, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8666:36:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "8636:66:48" }, { "assignments": [ 12032 ], "declarations": [ { "constant": false, "id": 12032, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 12049, "src": "8713:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12031, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8713:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12033, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "8713:22:48" }, { "assignments": [ 12035 ], "declarations": [ { "constant": false, "id": 12035, "name": "_scriptSigLen", "nodeType": "VariableDeclaration", "scope": 12049, "src": "8745:21:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12034, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8745:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12036, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "8745:21:48" }, { "expression": { "argumentTypes": null, "id": 12043, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 12037, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12032, "src": "8777:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 12038, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12035, "src": "8793:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 12039, "isConstant": false, "isInlineArray": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "TupleExpression", "src": "8776:31:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12041, "name": "_afterOutpoint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12021, "src": "8822:14:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12040, "name": "parseVarInt", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11599, "src": "8810:11:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256,uint256)" } }, "id": 12042, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8810:27:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "src": "8776:61:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12044, "nodeType": "ExpressionStatement", "src": "8776:61:48" }, { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 12045, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12032, "src": "8856:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 12046, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12035, "src": "8872:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 12047, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "8855:31:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "functionReturnParameters": 12009, "id": 12048, "nodeType": "Return", "src": "8848:38:48" } ] }, "documentation": "@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", "id": 12050, "implemented": true, "kind": "function", "modifiers": [], "name": "extractScriptSigLen", "nodeType": "FunctionDefinition", "parameters": { "id": 12004, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12003, "name": "_input", "nodeType": "VariableDeclaration", "scope": 12050, "src": "8483:19:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12002, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "8483:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, 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"typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "8526:18:48" }, "scope": 13216, "src": "8454:439:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12088, "nodeType": "Block", "src": "9234:289:48", "statements": [ { "assignments": [ 12058 ], "declarations": [ { "constant": false, "id": 12058, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 12088, "src": "9244:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12057, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9244:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12059, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "9244:22:48" }, { "assignments": [ 12061 ], "declarations": [ { "constant": false, "id": 12061, "name": "_scriptSigLen", "nodeType": "VariableDeclaration", "scope": 12088, "src": "9276:21:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12060, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9276:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12062, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "9276:21:48" }, { "expression": { "argumentTypes": null, "id": 12069, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 12063, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12058, "src": "9308:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 12064, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12061, "src": "9324:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 12065, "isConstant": false, "isInlineArray": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "TupleExpression", "src": "9307:31:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12067, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12052, "src": "9361:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12066, "name": "extractScriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12050, "src": "9341:19:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256,uint256)" } }, "id": 12068, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9341:27:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "src": "9307:61:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12070, "nodeType": "ExpressionStatement", "src": "9307:61:48" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12073, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 12071, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12058, "src": "9382:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 12072, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "9400:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9382:29:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 12077, "nodeType": "IfStatement", "src": "9378:78:48", "trueBody": { "id": 12076, "nodeType": "Block", "src": "9413:43:48", "statements": [ { "expression": { "argumentTypes": null, "id": 12074, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "9434:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 12056, "id": 12075, "nodeType": "Return", "src": "9427:18:48" } ] } }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12086, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12084, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12082, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, "id": 12080, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "3336", "id": 12078, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9473:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 12079, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9478:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "9473:6:48", "typeDescriptions": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12081, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12058, "src": "9482:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9473:23:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12083, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12061, "src": "9499:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9473:39:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "34", "id": 12085, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9515:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" }, "src": "9473:43:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 12056, "id": 12087, "nodeType": "Return", "src": "9466:50:48" } ] }, "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": 12089, "implemented": true, "kind": "function", "modifiers": [], "name": "determineInputLength", "nodeType": "FunctionDefinition", "parameters": { "id": 12053, "nodeType": "ParameterList", "parameters": [ { "constant": false, 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"uint256" } }, "value": null, "visibility": "internal" } ], "src": "9224:9:48" }, "scope": 13216, "src": "9151:372:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12129, "nodeType": "Block", "src": "9852:289:48", "statements": [ { "assignments": [ 12097 ], "declarations": [ { "constant": false, "id": 12097, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 12129, "src": "9862:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12096, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9862:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12098, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "9862:22:48" }, { "assignments": [ 12100 ], "declarations": [ { "constant": false, "id": 12100, "name": "_scriptSigLen", "nodeType": "VariableDeclaration", "scope": 12129, "src": "9894:21:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12099, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9894:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12101, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "9894:21:48" }, { "expression": { "argumentTypes": null, "id": 12108, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 12102, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12097, "src": "9926:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 12103, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12100, "src": "9942:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 12104, "isConstant": false, "isInlineArray": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "TupleExpression", "src": "9925:31:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12106, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12091, "src": "9979:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12105, "name": "extractScriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12050, "src": "9959:19:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256,uint256)" } }, "id": 12107, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9959:27:48", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_uint256_$_t_uint256_$", "typeString": "tuple(uint256,uint256)" } }, "src": "9925:61:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12109, "nodeType": "ExpressionStatement", "src": "9925:61:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12113, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 12111, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12097, "src": "10004:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 12112, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "10022:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10004:29:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "42616420566172496e7420696e20736372697074536967", "id": 12114, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10035:25:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" }, "value": "Bad VarInt in scriptSig" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_5a8a4de2c8904c92ac1068c35465c2d5adf89b19d43265f879508348e387f026", "typeString": "literal_string \"Bad VarInt in scriptSig\"" } ], "id": 12110, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "9996:7:48", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 12115, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9996:65:48", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12116, "nodeType": "ExpressionStatement", "src": "9996:65:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12125, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12123, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" }, "id": 12121, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "3336", "id": 12119, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10091:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_36_by_1", "typeString": "int_const 36" }, "value": "36" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 12120, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10096:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "10091:6:48", "typeDescriptions": { "typeIdentifier": "t_rational_37_by_1", "typeString": "int_const 37" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12122, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12097, "src": "10100:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10091:23:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12124, "name": "_scriptSigLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12100, "src": "10117:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10091:39:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "34", "id": 12126, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10132:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" } ], "expression": { "argumentTypes": null, "id": 12117, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12091, "src": "10078:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12118, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "10078:12:48", "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": 12127, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10078:56:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 12095, "id": 12128, "nodeType": "Return", "src": "10071:63:48" } ] }, "documentation": "@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)", "id": 12130, "implemented": true, "kind": "function", "modifiers": [], "name": "extractSequenceLELegacy", "nodeType": "FunctionDefinition", "parameters": { "id": 12092, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12091, "name": "_input", "nodeType": "VariableDeclaration", "scope": 12130, "src": "9794:19:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12090, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "9794:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "9793:21:48" }, "returnParameters": { "id": 12095, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12094, "name": "", "nodeType": "VariableDeclaration", "scope": 12130, "src": "9838:12:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12093, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "9838:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "9837:14:48" }, "scope": 13216, "src": "9761:380:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12155, "nodeType": "Block", "src": "10464:189:48", "statements": [ { "assignments": [ 12138 ], "declarations": [ { "constant": false, "id": 12138, "name": "_leSeqence", "nodeType": "VariableDeclaration", "scope": 12155, "src": "10474:23:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12137, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "10474:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 12142, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12140, "name": "_input", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12132, "src": "10524:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12139, "name": "extractSequenceLELegacy", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12130, "src": "10500:23:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 12141, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10500:31:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "10474:57:48" }, { "assignments": [ 12144 ], "declarations": [ { "constant": false, "id": 12144, "name": "_beSequence", "nodeType": "VariableDeclaration", "scope": 12155, "src": "10541:24:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", 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"typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14174:22:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12331, "name": "_scriptPubkeyLength", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12309, "src": "14199:19:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14174:44:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 12285, "id": 12333, "nodeType": "Return", "src": "14167:51:48" } ] }, "documentation": "@notice Determines the length of an output\n @dev Works with any properly formatted output\n @param _output The output\n @return The length indicated by the prefix, error if invalid length", "id": 12335, "implemented": true, "kind": "function", "modifiers": [], "name": "determineOutputLength", "nodeType": "FunctionDefinition", "parameters": { "id": 12282, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12281, "name": "_output", "nodeType": "VariableDeclaration", "scope": 12335, "src": "13674:20:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12280, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13674:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "13673:22:48" }, "returnParameters": { "id": 12285, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12284, "name": "", "nodeType": "VariableDeclaration", "scope": 12335, "src": "13719:7:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12283, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13719:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "13718:9:48" }, "scope": 13216, "src": "13643:582:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12455, "nodeType": "Block", "src": "14693:884:48", "statements": [ { "assignments": [ 12345 ], "declarations": [ { "constant": false, "id": 12345, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 12455, "src": "14703:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12344, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14703:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 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"ExpressionStatement", "src": "14760:45:48" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12361, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 12359, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12345, "src": "14823:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 12360, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "14841:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14823:29:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "52656164206f76657272756e20647572696e6720566172496e742070617273696e67", "id": 12362, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "14854:36:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_44f1d85595cd9e7bca9d9a2d6049b01f75f753890836287504890b72b66f7afd", "typeString": "literal_string \"Read overrun during VarInt parsing\"" }, "value": "Read overrun during VarInt parsing" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_44f1d85595cd9e7bca9d9a2d6049b01f75f753890836287504890b72b66f7afd", "typeString": "literal_string \"Read overrun during VarInt parsing\"" } ], "id": 12358, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "14815:7:48", "typeDescriptions": { "typeIdentifier": 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"storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12372, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "14957:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 12374, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "14957:23:48" }, { "assignments": [ 12376 ], "declarations": [ { "constant": false, "id": 12376, "name": "_len", "nodeType": "VariableDeclaration", "scope": 12455, "src": "14991:12:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12375, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14991:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12378, 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null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12383, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "hexValue": "31", "id": 12381, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "15035:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "id": 12382, "name": "_varIntDataLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12345, "src": "15039:14:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "15035:18:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", 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"t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 12449, "name": "_vout", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12337, "src": "15544:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12450, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "15544:11:48", "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": 12453, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", 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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": 12456, "implemented": true, "kind": "function", "modifiers": [], "name": "extractOutputAtIndex", "nodeType": "FunctionDefinition", "parameters": { "id": 12340, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12337, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 12456, "src": "14620:18:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12336, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "14620:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 12339, "name": "_index", "nodeType": "VariableDeclaration", "scope": 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"t_rational_0_by_1", "typeString": "int_const 0" }, { "typeIdentifier": "t_rational_8_by_1", "typeString": "int_const 8" } ], "expression": { "argumentTypes": null, "id": 12463, "name": "_output", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12458, "src": "15912:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12464, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "15912:13:48", "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": 12467, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], 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"typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "20225:63:48" }, { "assignments": [ 12750 ], "declarations": [ { "constant": false, "id": 12750, "name": "_nextLen", "nodeType": "VariableDeclaration", "scope": 12766, "src": "20302:16:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12749, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "20302:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12754, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12752, "name": "_next", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12739, "src": "20342:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": 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"id": 12755, "name": "_nextLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12750, "src": "20366:8:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 12756, "name": "ERR_BAD_ARG", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11499, "src": "20378:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "20366:23:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 12761, "nodeType": "IfStatement", "src": "20362:74:48", "trueBody": { "id": 12760, "nodeType": "Block", "src": "20391:45:48", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 12758, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": 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"typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 12765, "nodeType": "ExpressionStatement", "src": "20498:19:48" } ] }, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12726, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 12724, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12721, "src": "19989:1:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 12725, "name": "_nIns", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12693, "src": "19993:5:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19989:9:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 12767, "initializationExpression": { "assignments": [ 12721 ], "declarations": [ { "constant": false, "id": 12721, "name": "i", "nodeType": "VariableDeclaration", "scope": 12767, "src": "19974:9:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12720, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "19974:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12723, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 12722, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "19986:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": 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"argumentTypes": null, "id": 12768, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12715, "src": "20602:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 12769, "name": "_vin", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12684, "src": "20613:4:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12770, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "20613:11:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "20602:22:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 12688, "id": 12772, "nodeType": "Return", "src": "20595:29:48" } ] }, "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": 12774, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVin", "nodeType": "FunctionDefinition", "parameters": { "id": 12685, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12684, "name": "_vin", "nodeType": "VariableDeclaration", "scope": 12774, "src": "19594:17:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12683, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "19594:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "19593:19:48" }, "returnParameters": { "id": 12688, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12687, "name": "", "nodeType": "VariableDeclaration", "scope": 12774, "src": "19636:4:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 12686, "name": "bool", "nodeType": "ElementaryTypeName", "src": "19636:4:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "19635:6:48" }, "scope": 13216, "src": "19573:1058:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12865, "nodeType": "Block", "src": "20974:1001:48", "statements": [ { "assignments": [ 12782 ], "declarations": [ { "constant": false, "id": 12782, "name": "_varIntDataLen", "nodeType": "VariableDeclaration", "scope": 12865, "src": "20984:22:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12781, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "20984:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12783, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "20984:22:48" }, { "assignments": [ 12785 ], "declarations": [ { "constant": false, "id": 12785, "name": "_nOuts", "nodeType": "VariableDeclaration", "scope": 12865, "src": "21016:14:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12784, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "21016:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, 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"typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 12780, "id": 12864, "nodeType": "Return", "src": "21938:30:48" } ] }, "documentation": "@notice Checks that the vout passed up is properly formatted\n @dev Consider a vout with a valid scriptpubkey\n @param _vout Raw bytes length-prefixed output vector\n @return True if it represents a validly formatted vout", "id": 12866, "implemented": true, "kind": "function", "modifiers": [], "name": "validateVout", "nodeType": "FunctionDefinition", "parameters": { "id": 12777, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12776, "name": "_vout", "nodeType": "VariableDeclaration", "scope": 12866, "src": "20925:18:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12775, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "20925:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "20924:20:48" }, "returnParameters": { "id": 12780, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12779, "name": "", "nodeType": "VariableDeclaration", "scope": 12866, "src": "20968:4:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 12778, "name": "bool", "nodeType": "ElementaryTypeName", "src": "20968:4:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "20967:6:48" }, "scope": 13216, "src": "20903:1072:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12879, "nodeType": "Block", "src": "22397:45:48", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { 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"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": 12880, "implemented": true, "kind": "function", "modifiers": [], "name": "extractMerkleRootLE", "nodeType": "FunctionDefinition", "parameters": { "id": 12869, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12868, "name": "_header", "nodeType": "VariableDeclaration", "scope": 12880, "src": "22338:20:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12867, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "22338:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "22337:22:48" }, "returnParameters": { "id": 12872, "nodeType": 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"name": "_exponent", "nodeType": "VariableDeclaration", "scope": 12924, "src": "22934:14:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12911, "name": "uint", "nodeType": "ElementaryTypeName", "src": "22934:4:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 12916, "initialValue": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 12915, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 12913, "name": "_e", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12896, "src": "22951:2:48", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { 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"typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "id": 12921, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "22987:18:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "22975:30:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 12886, "id": 12923, "nodeType": "Return", "src": "22968:37:48" } ] }, "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": 12925, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTarget", "nodeType": "FunctionDefinition", "parameters": { "id": 12883, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12882, "name": 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The block difficulty (bdiff)", "id": 12938, "implemented": true, "kind": "function", "modifiers": [], "name": "calculateDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 12928, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12927, "name": "_target", "nodeType": "VariableDeclaration", "scope": 12938, "src": "23421:15:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12926, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "23421:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "23420:17:48" }, "returnParameters": { "id": 12931, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12930, "name": "", "nodeType": "VariableDeclaration", "scope": 12938, "src": "23461:7:48", "stateVariable": false, "storageLocation": 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"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": 12959, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12954, "src": "24286:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 12960, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "slice", "nodeType": "MemberAccess", "referencedDeclaration": 13281, "src": "24286:13:48", "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": 12963, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "24286:20:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "functionReturnParameters": 12958, "id": 12964, "nodeType": "Return", "src": "24279:27:48" } ] }, "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": 12966, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestampLE", "nodeType": "FunctionDefinition", "parameters": { "id": 12955, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12954, "name": "_header", "nodeType": "VariableDeclaration", "scope": 12966, "src": "24210:20:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12953, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "24210:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "24209:22:48" }, "returnParameters": { "id": 12958, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12957, "name": "", "nodeType": "VariableDeclaration", "scope": 12966, "src": "24255:12:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12956, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "24255:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "24254:14:48" }, "scope": 13216, "src": "24182:131:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12983, "nodeType": "Block", "src": "24599:91:48", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12977, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12968, "src": "24672:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12976, "name": "extractTimestampLE", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12966, "src": "24653:18:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 12978, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "24653:27:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12975, "name": "reverseEndianness", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11643, "src": "24635:17:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes memory)" } }, "id": 12979, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "24635:46:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12974, "name": "bytesToUint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11790, "src": "24623:11:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 12980, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "24623:59:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 12973, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "24616:6:48", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint32_$", "typeString": "type(uint32)" }, "typeName": "uint32" }, "id": 12981, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "24616:67:48", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "functionReturnParameters": 12972, "id": 12982, "nodeType": "Return", "src": "24609:74:48" } ] }, "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": 12984, "implemented": true, "kind": "function", "modifiers": [], "name": "extractTimestamp", "nodeType": "FunctionDefinition", "parameters": { "id": 12969, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12968, "name": "_header", "nodeType": "VariableDeclaration", "scope": 12984, "src": "24546:20:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12967, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "24546:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "24545:22:48" }, "returnParameters": { "id": 12972, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12971, "name": "", "nodeType": "VariableDeclaration", "scope": 12984, "src": "24591:6:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" }, "typeName": { "id": 12970, "name": "uint32", "nodeType": "ElementaryTypeName", "src": "24591:6:48", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "value": null, "visibility": "internal" } ], "src": "24590:8:48" }, "scope": 13216, "src": "24520:170:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 12997, "nodeType": "Block", "src": "24995:67:48", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 12993, "name": "_header", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12986, "src": "25046:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 12992, "name": "extractTarget", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12925, "src": "25032:13:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 12994, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "25032:22:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 12991, "name": "calculateDifficulty", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12938, "src": "25012:19:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$returns$_t_uint256_$", "typeString": "function (uint256) pure returns (uint256)" } }, "id": 12995, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "25012:43:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 12990, "id": 12996, "nodeType": "Return", "src": "25005:50:48" } ] }, "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": 12998, "implemented": true, "kind": "function", "modifiers": [], "name": "extractDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 12987, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12986, "name": "_header", "nodeType": "VariableDeclaration", "scope": 12998, "src": "24941:20:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12985, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "24941:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "24940:22:48" }, "returnParameters": { "id": 12990, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12989, "name": "", "nodeType": "VariableDeclaration", "scope": 12998, "src": "24986:7:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12988, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "24986:7:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "24985:9:48" }, "scope": 13216, "src": "24914:148:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 13015, "nodeType": "Block", "src": "25392:57:48", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 13010, "name": "_a", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13000, "src": "25434:2:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 13011, "name": "_b", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13002, "src": "25438:2:48", "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": 13008, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 18347, "src": "25417:3:48", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 13009, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "25417:16:48", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 13012, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "25417:24:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 13007, "name": "hash256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11851, "src": "25409:7:48", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 13013, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "25409:33:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 13006, "id": 13014, "nodeType": "Return", "src": "25402:40:48" } ] }, "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": 13016, "implemented": true, "kind": "function", "modifiers": [], "name": "_hash256MerkleStep", "nodeType": "FunctionDefinition", "parameters": { "id": 13003, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13000, "name": "_a", "nodeType": "VariableDeclaration", "scope": 13016, "src": "25326:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 12999, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "25326:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 13002, "name": "_b", "nodeType": "VariableDeclaration", "scope": 13016, "src": "25343:15:48", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 13001, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "25343:5:48", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "25325:34:48" }, "returnParameters": { "id": 13006, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13005, "name": "", "nodeType": "VariableDeclaration", "scope": 13016, "src": "25383:7:48", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13004, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "25383:7:48", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "25382:9:48" }, "scope": 13216, "src": "25298:151:48", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { "id": 13147, "nodeType": "Block", "src": "25862:917:48", "statements": [ { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 13030, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 13028, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 13025, "name": "_proof", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13018, "src": "25916:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 13026, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "25916:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "%", "rightExpression": { "argumentTypes": null, "hexValue": "3332", "id": 13027, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "25932:2:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_32_by_1", "typeString": "int_const 32" }, "value": "32" }, "src": "25916:18:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 13029, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "25938:1:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "25916:23:48", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 13034, "nodeType": "IfStatement", "src": "25912:66:48", "trueBody": { "id": 13033, "nodeType": "Block", "src": "25941:37:48", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 13031, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "25962:5:48", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 13024, "id": 13032, "nodeType": "Return", "src": "25955:12:48" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 13038, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 13035, "name": "_proof", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13018, "src": "26041:6:48", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 13036, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "26041:13:48", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": 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