{ "contractName": "Relay", "abi": [ { "inputs": [ { "internalType": "bytes", "name": "_genesisHeader", "type": "bytes" }, { "internalType": "uint256", "name": "_height", "type": "uint256" }, { "internalType": "bytes32", "name": "_periodStart", "type": "bytes32" } ], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "bytes32", "name": "_first", "type": "bytes32" }, { "indexed": true, "internalType": "bytes32", "name": "_last", "type": "bytes32" } ], "name": "Extension", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "bytes32", "name": "_from", "type": "bytes32" }, { "indexed": true, "internalType": "bytes32", "name": "_to", "type": "bytes32" }, { "indexed": true, "internalType": "bytes32", "name": "_gcd", "type": "bytes32" } ], "name": "NewTip", "type": "event" }, { "constant": true, "inputs": [], "name": "HEIGHT_INTERVAL", "outputs": [ { "internalType": "uint32", "name": "", "type": "uint32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getCurrentEpochDifficulty", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getPrevEpochDifficulty", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getRelayGenesis", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getBestKnownDigest", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getLastReorgCommonAncestor", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "bytes32", "name": "_digest", "type": "bytes32" } ], "name": "findHeight", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "bytes32", "name": "_digest", "type": "bytes32" }, { "internalType": "uint256", "name": "_offset", "type": "uint256" } ], "name": "findAncestor", "outputs": [ { "internalType": "bytes32", "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "internalType": "bytes32", "name": "_ancestor", "type": "bytes32" }, { "internalType": "bytes32", "name": "_descendant", "type": "bytes32" }, { "internalType": "uint256", "name": "_limit", "type": "uint256" } ], "name": "isAncestor", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "bytes", "name": "_anchor", "type": "bytes" }, { "internalType": "bytes", "name": "_headers", "type": "bytes" } ], "name": "addHeaders", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "bytes", "name": "_oldPeriodStartHeader", "type": "bytes" }, { "internalType": "bytes", "name": "_oldPeriodEndHeader", "type": "bytes" }, { "internalType": "bytes", "name": "_headers", "type": "bytes" } ], "name": "addHeadersWithRetarget", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "internalType": "bytes32", "name": "_ancestor", "type": "bytes32" }, { "internalType": "bytes", "name": "_currentBest", "type": "bytes" }, { "internalType": "bytes", "name": "_newBest", "type": "bytes" }, { "internalType": "uint256", "name": "_limit", "type": "uint256" } ], "name": "markNewHeaviest", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_genesisHeader\",\"type\":\"bytes\"},{\"internalType\":\"uint256\",\"name\":\"_height\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_periodStart\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_first\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_last\",\"type\":\"bytes32\"}],\"name\":\"Extension\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_from\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_to\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_gcd\",\"type\":\"bytes32\"}],\"name\":\"NewTip\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"HEIGHT_INTERVAL\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_anchor\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"_headers\",\"type\":\"bytes\"}],\"name\":\"addHeaders\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_oldPeriodStartHeader\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"_oldPeriodEndHeader\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"_headers\",\"type\":\"bytes\"}],\"name\":\"addHeadersWithRetarget\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_digest\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_offset\",\"type\":\"uint256\"}],\"name\":\"findAncestor\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_digest\",\"type\":\"bytes32\"}],\"name\":\"findHeight\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getBestKnownDigest\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getCurrentEpochDifficulty\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastReorgCommonAncestor\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getPrevEpochDifficulty\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getRelayGenesis\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_ancestor\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_descendant\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_limit\",\"type\":\"uint256\"}],\"name\":\"isAncestor\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_ancestor\",\"type\":\"bytes32\"},{\"internalType\":\"bytes\",\"name\":\"_currentBest\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"_newBest\",\"type\":\"bytes\"},{\"internalType\":\"uint256\",\"name\":\"_limit\",\"type\":\"uint256\"}],\"name\":\"markNewHeaviest\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"addHeaders(bytes,bytes)\":{\"details\":\"We check integrity and consistency of the header chain\",\"params\":{\"_anchor\":\"The header immediately preceeding the new chain\",\"_headers\":\"A tightly-packed list of 80-byte Bitcoin headers\"},\"return\":\"True if successfully written, error otherwise\"},\"addHeadersWithRetarget(bytes,bytes,bytes)\":{\"details\":\"Checks the retarget, the heights, and the linkage\",\"params\":{\"_headers\":\"A tightly-packed list of 80-byte Bitcoin headers\",\"_oldPeriodEndHeader\":\"The last header in the difficulty period being closed\",\"_oldPeriodStartHeader\":\"The first header in the difficulty period being closed\"},\"return\":\"True if successfully written, error otherwise\"},\"constructor\":{\"details\":\"We don't check this AT ALL really. Don't use relays with bad genesis\",\"params\":{\"_genesisHeader\":\"The starting header\",\"_height\":\"The starting height\",\"_periodStart\":\"The hash of the first header in the genesis epoch\"}},\"findAncestor(bytes32,uint256)\":{\"details\":\"Will fail if the header is unknown\",\"params\":{\"_digest\":\"The header digest to search for\"},\"return\":\"The height of the header, or error if unknown\"},\"findHeight(bytes32)\":{\"details\":\"Will fail if the header is unknown\",\"params\":{\"_digest\":\"The header digest to search for\"},\"return\":\"The height of the header, or error if unknown\"},\"getBestKnownDigest()\":{\"details\":\"This updated only by calling markNewHeaviest\",\"return\":\"The hash of the best marked chain tip\"},\"getCurrentEpochDifficulty()\":{\"details\":\"This is updated when a new heavist header has a new diff\",\"return\":\"The difficulty of the bestKnownDigest\"},\"getLastReorgCommonAncestor()\":{\"details\":\"This is updated only by calling markNewHeaviest\",\"return\":\"The hash of the shared ancestor of the most recent fork\"},\"getPrevEpochDifficulty()\":{\"details\":\"This is updated when a difficulty change is accepted\",\"return\":\"The difficulty of the previous epoch\"},\"getRelayGenesis()\":{\"details\":\"This is an initialization parameter\",\"return\":\"The hash of the first block of the relay\"},\"isAncestor(bytes32,bytes32,uint256)\":{\"details\":\"Limit the amount of lookups (and thus gas usage) with _limit\",\"params\":{\"_ancestor\":\"The prospective ancestor\",\"_descendant\":\"The descendant to check\",\"_limit\":\"The maximum number of blocks to check\"},\"return\":\"true if ancestor is at most limit blocks lower than descendant, otherwise false\"},\"markNewHeaviest(bytes32,bytes,bytes,uint256)\":{\"details\":\"We don't check this AT ALL really. Don't use relays with bad genesis\",\"params\":{\"_ancestor\":\"The digest of the most recent common ancestor\",\"_currentBest\":\"The 80-byte header referenced by bestKnownDigest\",\"_limit\":\"Limit the amount of traversal of the chain\",\"_newBest\":\"The 80-byte header to mark as the new best\"},\"return\":\"True if successfully updates bestKnownDigest, error otherwise\"}}},\"userdoc\":{\"methods\":{\"addHeaders(bytes,bytes)\":{\"notice\":\"Adds headers to storage after validating\"},\"addHeadersWithRetarget(bytes,bytes,bytes)\":{\"notice\":\"Adds headers to storage, performs additional validation of retarget\"},\"constructor\":\"Gives a starting point for the relay\",\"findAncestor(bytes32,uint256)\":{\"notice\":\"Finds an ancestor for a block by its digest\"},\"findHeight(bytes32)\":{\"notice\":\"Finds the height of a header by its digest\"},\"getBestKnownDigest()\":{\"notice\":\"Getter for bestKnownDigest\"},\"getCurrentEpochDifficulty()\":{\"notice\":\"Getter for currentEpochDiff\"},\"getLastReorgCommonAncestor()\":{\"notice\":\"Getter for relayGenesis\"},\"getPrevEpochDifficulty()\":{\"notice\":\"Getter for prevEpochDiff\"},\"getRelayGenesis()\":{\"notice\":\"Getter for relayGenesis\"},\"isAncestor(bytes32,bytes32,uint256)\":{\"notice\":\"Checks if a digest is an ancestor of the current one\"},\"markNewHeaviest(bytes32,bytes,bytes,uint256)\":{\"notice\":\"Gives a starting point for the relay\"}}}},\"settings\":{\"compilationTarget\":{\"@summa-tx/relay-sol/contracts/Relay.sol\":\"Relay\"},\"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\"]},\"@summa-tx/bitcoin-spv-sol/contracts/ValidateSPV.sol\":{\"keccak256\":\"0x9af3b3f36de63e95977f09548617989e391b3c511cf0383ee35cefd5da7d3bfd\",\"urls\":[\"bzz-raw://97ce025c7d18540e4c24578db61cc5e33828be8e9a82b5cb5f46c99212f75ed1\",\"dweb:/ipfs/QmRrdWnd95rgCZzeaNiU4KUcGe1j7oDBj7LatpXhUmjbEE\"]},\"@summa-tx/relay-sol/contracts/Interfaces.sol\":{\"keccak256\":\"0x6f2698f8aab5cee319f36d69438b6870496a5523e7ccac4b465cdb38661242fa\",\"urls\":[\"bzz-raw://7f854c72db81631d1df800ae0c5fb0a50dc9efd97b0e6593b063c9fb1c61ef9e\",\"dweb:/ipfs/QmUMSQhzYKRSkLTGcHekjqvw1mLpeUULZkfffRdN521NBg\"]},\"@summa-tx/relay-sol/contracts/Relay.sol\":{\"keccak256\":\"0x4a6d12fa6570e2c787f9dc234edae9c1eb326e78eb2c6384c84d2b6ba0a0ad7e\",\"urls\":[\"bzz-raw://fa5365dc5a8312d0305568dbf297964be13567a7879395bfc3e99be2510e4e10\",\"dweb:/ipfs/QmfGZz6iL45xPcwQTT3XFAqb7McuY89niBEvfbhy513moF\"]}},\"version\":1}", 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"source": "pragma solidity ^0.5.10;\n\n/** @title Relay */\n/** @author Summa (https://summa.one) */\n\nimport {SafeMath} from \"@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol\";\nimport {BytesLib} from \"@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol\";\nimport {BTCUtils} from \"@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol\";\nimport {ValidateSPV} from \"@summa-tx/bitcoin-spv-sol/contracts/ValidateSPV.sol\";\nimport {IRelay} from \"./Interfaces.sol\";\n\ncontract Relay is IRelay {\n using SafeMath for uint256;\n using BytesLib for bytes;\n using BTCUtils for bytes;\n using ValidateSPV for bytes;\n\n // How often do we store the height?\n // A higher number incurs less storage cost, but more lookup cost\n uint32 public constant HEIGHT_INTERVAL = 4;\n\n bytes32 internal relayGenesis;\n bytes32 internal bestKnownDigest;\n bytes32 internal lastReorgCommonAncestor;\n mapping (bytes32 => bytes32) internal previousBlock;\n mapping (bytes32 => uint256) internal blockHeight;\n\n uint256 internal currentEpochDiff;\n uint256 internal prevEpochDiff;\n\n\n /// @notice Gives a starting point for the relay\n /// @dev We don't check this AT ALL really. Don't use relays with bad genesis\n /// @param _genesisHeader The starting header\n /// @param _height The starting height\n /// @param _periodStart The hash of the first header in the genesis epoch\n constructor(bytes memory _genesisHeader, uint256 _height, bytes32 _periodStart) public {\n require(_genesisHeader.length == 80, \"Stop being dumb\");\n bytes32 _genesisDigest = _genesisHeader.hash256();\n\n require(\n _periodStart & bytes32(0x0000000000000000000000000000000000000000000000000000000000ffffff) == bytes32(0),\n \"Period start hash does not have work. Hint: wrong byte order?\");\n\n relayGenesis = _genesisDigest;\n bestKnownDigest = _genesisDigest;\n lastReorgCommonAncestor = _genesisDigest;\n blockHeight[_genesisDigest] = _height;\n blockHeight[_periodStart] = _height.sub(_height % 2016);\n\n currentEpochDiff = _genesisHeader.extractDifficulty();\n }\n\n /// @notice Getter for currentEpochDiff\n /// @dev This is updated when a new heavist header has a new diff\n /// @return The difficulty of the bestKnownDigest\n function getCurrentEpochDifficulty() external view returns (uint256) {\n return currentEpochDiff;\n }\n /// @notice Getter for prevEpochDiff\n /// @dev This is updated when a difficulty change is accepted\n /// @return The difficulty of the previous epoch\n function getPrevEpochDifficulty() external view returns (uint256) {\n return prevEpochDiff;\n }\n\n /// @notice Getter for relayGenesis\n /// @dev This is an initialization parameter\n /// @return The hash of the first block of the relay\n function getRelayGenesis() public view returns (bytes32) {\n return relayGenesis;\n }\n\n /// @notice Getter for bestKnownDigest\n /// @dev This updated only by calling markNewHeaviest\n /// @return The hash of the best marked chain tip\n function getBestKnownDigest() public view returns (bytes32) {\n return bestKnownDigest;\n }\n\n /// @notice Getter for relayGenesis\n /// @dev This is updated only by calling markNewHeaviest\n /// @return The hash of the shared ancestor of the most recent fork\n function getLastReorgCommonAncestor() public view returns (bytes32) {\n return lastReorgCommonAncestor;\n }\n\n /// @notice Finds the height of a header by its digest\n /// @dev Will fail if the header is unknown\n /// @param _digest The header digest to search for\n /// @return The height of the header, or error if unknown\n function findHeight(bytes32 _digest) external view returns (uint256) {\n return _findHeight(_digest);\n }\n\n /// @notice Finds an ancestor for a block by its digest\n /// @dev Will fail if the header is unknown\n /// @param _digest The header digest to search for\n /// @return The height of the header, or error if unknown\n function findAncestor(bytes32 _digest, uint256 _offset) external view returns (bytes32) {\n return _findAncestor(_digest, _offset);\n }\n\n /// @notice Checks if a digest is an ancestor of the current one\n /// @dev Limit the amount of lookups (and thus gas usage) with _limit\n /// @param _ancestor The prospective ancestor\n /// @param _descendant The descendant to check\n /// @param _limit The maximum number of blocks to check\n /// @return true if ancestor is at most limit blocks lower than descendant, otherwise false\n function isAncestor(bytes32 _ancestor, bytes32 _descendant, uint256 _limit) external view returns (bool) {\n return _isAncestor(_ancestor, _descendant, _limit);\n }\n\n /// @notice Adds headers to storage after validating\n /// @dev We check integrity and consistency of the header chain\n /// @param _anchor The header immediately preceeding the new chain\n /// @param _headers A tightly-packed list of 80-byte Bitcoin headers\n /// @return True if successfully written, error otherwise\n function addHeaders(bytes calldata _anchor, bytes calldata _headers) external returns (bool) {\n return _addHeaders(_anchor, _headers, false);\n }\n\n /// @notice Adds headers to storage, performs additional validation of retarget\n /// @dev Checks the retarget, the heights, and the linkage\n /// @param _oldPeriodStartHeader The first header in the difficulty period being closed\n /// @param _oldPeriodEndHeader The last header in the difficulty period being closed\n /// @param _headers A tightly-packed list of 80-byte Bitcoin headers\n /// @return True if successfully written, error otherwise\n function addHeadersWithRetarget(\n bytes calldata _oldPeriodStartHeader,\n bytes calldata _oldPeriodEndHeader,\n bytes calldata _headers\n ) external returns (bool) {\n return _addHeadersWithRetarget(_oldPeriodStartHeader, _oldPeriodEndHeader, _headers);\n }\n\n /// @notice Gives a starting point for the relay\n /// @dev We don't check this AT ALL really. Don't use relays with bad genesis\n /// @param _ancestor The digest of the most recent common ancestor\n /// @param _currentBest The 80-byte header referenced by bestKnownDigest\n /// @param _newBest The 80-byte header to mark as the new best\n /// @param _limit Limit the amount of traversal of the chain\n /// @return True if successfully updates bestKnownDigest, error otherwise\n function markNewHeaviest(\n bytes32 _ancestor,\n bytes calldata _currentBest,\n bytes calldata _newBest,\n uint256 _limit\n ) external returns (bool) {\n return _markNewHeaviest(_ancestor, _currentBest, _newBest, _limit);\n }\n\n /// @notice Adds headers to storage after validating\n /// @dev We check integrity and consistency of the header chain\n /// @param _anchor The header immediately preceeding the new chain\n /// @param _headers A tightly-packed list of new 80-byte Bitcoin headers to record\n /// @param _internal True if called internally from addHeadersWithRetarget, false otherwise\n /// @return True if successfully written, error otherwise\n function _addHeaders(bytes memory _anchor, bytes memory _headers, bool _internal) internal returns (bool) {\n uint256 _height;\n bytes memory _header;\n bytes32 _currentDigest;\n bytes32 _previousDigest = _anchor.hash256();\n\n uint256 _target = _headers.slice(0, 80).extractTarget();\n uint256 _anchorHeight = _findHeight(_previousDigest); /* NB: errors if unknown */\n\n require(\n _internal || _anchor.extractTarget() == _target,\n \"Unexpected retarget on external call\");\n require(_headers.length % 80 == 0, \"Header array length must be divisible by 80\");\n\n /*\n NB:\n 1. check that the header has sufficient work\n 2. check that headers are in a coherent chain (no retargets, hash links good)\n 3. Store the block connection\n 4. Store the height\n */\n for (uint256 i = 0; i < _headers.length / 80; i = i.add(1)) {\n _header = _headers.slice(i.mul(80), 80);\n _height = _anchorHeight.add(i + 1);\n _currentDigest = _header.hash256();\n\n /*\n NB:\n if the block is already authenticated, we don't need to a work check\n Or write anything to state. This saves gas\n */\n if (previousBlock[_currentDigest] == bytes32(0)) {\n require(\n abi.encodePacked(_currentDigest).reverseEndianness().bytesToUint() <= _target,\n \"Header work is insufficient\");\n previousBlock[_currentDigest] = _previousDigest;\n if (_height % HEIGHT_INTERVAL == 0) {\n /*\n NB: We store the height only every 4th header to save gas\n */\n blockHeight[_currentDigest] = _height;\n }\n }\n\n /* NB: we do still need to make chain level checks tho */\n require(_header.extractTarget() == _target, \"Target changed unexpectedly\");\n require(_header.validateHeaderPrevHash(_previousDigest), \"Headers do not form a consistent chain\");\n\n _previousDigest = _currentDigest;\n }\n\n emit Extension(\n _anchor.hash256(),\n _currentDigest);\n return true;\n }\n\n /// @notice Adds headers to storage, performs additional validation of retarget\n /// @dev Checks the retarget, the heights, and the linkage\n /// @param _oldPeriodStartHeader The first header in the difficulty period being closed\n /// @param _oldPeriodEndHeader The last header in the difficulty period being closed\n /// @param _headers A tightly-packed list of 80-byte Bitcoin headers\n /// @return True if successfully written, error otherwise\n function _addHeadersWithRetarget(\n bytes memory _oldPeriodStartHeader,\n bytes memory _oldPeriodEndHeader,\n bytes memory _headers\n ) internal returns (bool) {\n /* NB: requires that both blocks are known */\n uint256 _startHeight = _findHeight(_oldPeriodStartHeader.hash256());\n uint256 _endHeight = _findHeight(_oldPeriodEndHeader.hash256());\n\n /* NB: retargets should happen at 2016 block intervals */\n require(\n _endHeight % 2016 == 2015,\n \"Must provide the last header of the closing difficulty period\");\n require(\n _endHeight == _startHeight.add(2015),\n \"Must provide exactly 1 difficulty period\");\n require(\n _oldPeriodStartHeader.extractDifficulty() == _oldPeriodEndHeader.extractDifficulty(),\n \"Period header difficulties do not match\");\n\n /* NB: This comparison looks weird because header nBits encoding truncates targets */\n bytes memory _newPeriodStart = _headers.slice(0, 80);\n uint256 _actualTarget = _newPeriodStart.extractTarget();\n uint256 _expectedTarget = BTCUtils.retargetAlgorithm(\n _oldPeriodStartHeader.extractTarget(),\n _oldPeriodStartHeader.extractTimestamp(),\n _oldPeriodEndHeader.extractTimestamp()\n );\n require(\n (_actualTarget & _expectedTarget) == _actualTarget,\n \"Invalid retarget provided\");\n\n // If the current known prevEpochDiff doesn't match, and this old period is near the chaintip/\n // update the stored prevEpochDiff\n // Don't update if this is a deep past epoch\n uint256 _oldDiff = _oldPeriodStartHeader.extractDifficulty();\n if (prevEpochDiff != _oldDiff && _endHeight > _findHeight(bestKnownDigest).sub(2016)) {\n prevEpochDiff = _oldDiff;\n }\n\n // Pass all but the first through to be added\n return _addHeaders(_oldPeriodEndHeader, _headers, true);\n }\n\n /// @notice Finds the height of a header by its digest\n /// @dev Will fail if the header is unknown\n /// @param _digest The header digest to search for\n /// @return The height of the header\n function _findHeight(bytes32 _digest) internal view returns (uint256) {\n uint256 _height = 0;\n bytes32 _current = _digest;\n for (uint256 i = 0; i < HEIGHT_INTERVAL + 1; i = i.add(1)) {\n _height = blockHeight[_current];\n if (_height == 0) {\n _current = previousBlock[_current];\n } else {\n return _height.add(i);\n }\n }\n revert(\"Unknown block\");\n }\n\n /// @notice Finds an ancestor for a block by its digest\n /// @dev Will fail if the header is unknown\n /// @param _digest The header digest to search for\n /// @return The height of the header, or error if unknown\n function _findAncestor(bytes32 _digest, uint256 _offset) internal view returns (bytes32) {\n bytes32 _current = _digest;\n for (uint256 i = 0; i < _offset; i = i.add(1)) {\n _current = previousBlock[_current];\n }\n require(_current != bytes32(0), \"Unknown ancestor\");\n return _current;\n }\n\n /// @notice Checks if a digest is an ancestor of the current one\n /// @dev Limit the amount of lookups (and thus gas usage) with _limit\n /// @param _ancestor The prospective ancestor\n /// @param _descendant The descendant to check\n /// @param _limit The maximum number of blocks to check\n /// @return true if ancestor is at most limit blocks lower than descendant, otherwise false\n function _isAncestor(bytes32 _ancestor, bytes32 _descendant, uint256 _limit) internal view returns (bool) {\n bytes32 _current = _descendant;\n /* NB: 200 gas/read, so gas is capped at ~200 * limit */\n for (uint256 i = 0; i < _limit; i = i.add(1)) {\n if (_current == _ancestor) {\n return true;\n }\n _current = previousBlock[_current];\n }\n return false;\n }\n\n /// @notice Marks the new best-known chain tip\n /// @param _ancestor The digest of the most recent common ancestor\n /// @param _currentBest The 80-byte header referenced by bestKnownDigest\n /// @param _newBest The 80-byte header to mark as the new best\n /// @param _limit Limit the amount of traversal of the chain\n /// @return True if successfully updates bestKnownDigest, error otherwise\n function _markNewHeaviest(\n bytes32 _ancestor,\n bytes memory _currentBest,\n bytes memory _newBest,\n uint256 _limit\n ) internal returns (bool) {\n require(_limit <= 2016, \"Requested limit is greater than 1 difficulty period\");\n bytes32 _newBestDigest = _newBest.hash256();\n bytes32 _currentBestDigest = _currentBest.hash256();\n require(_currentBestDigest == bestKnownDigest, \"Passed in best is not best known\");\n require(\n previousBlock[_newBestDigest] != bytes32(0),\n \"New best is unknown\");\n require(\n _isMostRecentAncestor(_ancestor, bestKnownDigest, _newBestDigest, _limit),\n \"Ancestor must be heaviest common ancestor\");\n require(\n _heaviestFromAncestor(_ancestor, _currentBest, _newBest) == _newBestDigest,\n \"New best hash does not have more work than previous\");\n\n bestKnownDigest = _newBestDigest;\n lastReorgCommonAncestor = _ancestor;\n\n uint256 _newDiff = _newBest.extractDifficulty();\n if (_newDiff != currentEpochDiff) {\n currentEpochDiff = _newDiff;\n }\n\n emit NewTip(\n _currentBestDigest,\n _newBestDigest,\n _ancestor);\n return true;\n }\n\n /// @notice Checks if a digest is an ancestor of the current one\n /// @dev Limit the amount of lookups (and thus gas usage) with _limit\n /// @param _ancestor The prospective shared ancestor\n /// @param _left A chain tip\n /// @param _right A chain tip\n /// @param _limit The maximum number of blocks to check\n /// @return true if it is the most recent common ancestor within _limit, false otherwise\n function _isMostRecentAncestor(\n bytes32 _ancestor,\n bytes32 _left,\n bytes32 _right,\n uint256 _limit\n ) internal view returns (bool) {\n /* NB: sure why not */\n if (_ancestor == _left && _ancestor == _right) {\n return true;\n }\n\n bytes32 _leftCurrent = _left;\n bytes32 _rightCurrent = _right;\n bytes32 _leftPrev = _left;\n bytes32 _rightPrev = _right;\n\n for(uint256 i = 0; i < _limit; i = i.add(1)) {\n if (_leftPrev != _ancestor) {\n _leftCurrent = _leftPrev; // cheap\n _leftPrev = previousBlock[_leftPrev]; // expensive\n }\n if (_rightPrev != _ancestor) {\n _rightCurrent = _rightPrev; // cheap\n _rightPrev = previousBlock[_rightPrev]; // expensive\n }\n }\n if (_leftCurrent == _rightCurrent) {return false;} /* NB: If the same, they're a nearer ancestor */\n if (_leftPrev != _rightPrev) {return false;} /* NB: Both must be ancestor */\n return true;\n }\n\n /// @notice Decides which header is heaviest from the ancestor\n /// @dev Does not support reorgs above 2017 blocks (:\n /// @param _ancestor The prospective shared ancestor\n /// @param _left A chain tip\n /// @param _right A chain tip\n /// @return true if it is the most recent common ancestor within _limit, false otherwise\n function _heaviestFromAncestor(\n bytes32 _ancestor,\n bytes memory _left,\n bytes memory _right\n ) internal view returns (bytes32) {\n uint256 _ancestorHeight = _findHeight(_ancestor);\n uint256 _leftHeight = _findHeight(_left.hash256());\n uint256 _rightHeight = _findHeight(_right.hash256());\n\n require(\n _leftHeight >= _ancestorHeight && _rightHeight >= _ancestorHeight,\n \"A descendant height is below the ancestor height\");\n\n /* NB: we can shortcut if one block is in a new difficulty window and the other isn't */\n uint256 _nextPeriodStartHeight = _ancestorHeight.add(2016).sub(_ancestorHeight % 2016);\n bool _leftInPeriod = _leftHeight < _nextPeriodStartHeight;\n bool _rightInPeriod = _rightHeight < _nextPeriodStartHeight;\n\n /*\n NB:\n 1. Left is in a new window, right is in the old window. Left is heavier\n 2. Right is in a new window, left is in the old window. Right is heavier\n 3. Both are in the same window, choose the higher one\n 4. They're in different new windows. Choose the heavier one\n */\n if (!_leftInPeriod && _rightInPeriod) {return _left.hash256();}\n if (_leftInPeriod && !_rightInPeriod) {return _right.hash256();}\n if (_leftInPeriod && _rightInPeriod) {\n return _leftHeight >= _rightHeight ? _left.hash256() : _right.hash256();\n } else { // if (!_leftInPeriod && !_rightInPeriod) {\n if (((_leftHeight % 2016).mul(_left.extractDifficulty())) <\n (_rightHeight % 2016).mul(_right.extractDifficulty())) {\n return _right.hash256();\n } else {\n return _left.hash256();\n }\n }\n }\n}\n\n// For unittests\ncontract TestRelay is Relay {\n\n /// @notice Gives a starting point for the relay\n /// @dev We don't check this AT ALL really. Don't use relays with bad genesis\n /// @param _genesisHeader The starting header\n /// @param _height The starting height\n /// @param _periodStart The hash of the first header in the genesis epoch\n constructor(bytes memory _genesisHeader, uint256 _height, bytes32 _periodStart)\n Relay(_genesisHeader, _height, _periodStart)\n public {}\n\n function heaviestFromAncestor(\n bytes32 _ancestor,\n bytes calldata _left,\n bytes calldata _right\n ) external view returns (bytes32) {\n return _heaviestFromAncestor(_ancestor, _left, _right);\n }\n\n function isMostRecentAncestor(\n bytes32 _ancestor,\n bytes32 _left,\n bytes32 _right,\n uint256 _limit\n ) external view returns (bool) {\n return _isMostRecentAncestor(_ancestor, _left, _right, _limit);\n }\n}\n", "sourcePath": "@summa-tx/relay-sol/contracts/Relay.sol", "ast": { "absolutePath": "@summa-tx/relay-sol/contracts/Relay.sol", "exportedSymbols": { "Relay": [ 16343 ], "TestRelay": [ 16400 ] }, "id": 16401, "nodeType": "SourceUnit", "nodes": [ { "id": 15279, "literals": [ "solidity", "^", "0.5", ".10" ], "nodeType": "PragmaDirective", "src": "0:24:55" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol", "file": "@summa-tx/bitcoin-spv-sol/contracts/SafeMath.sol", "id": 15281, "nodeType": "ImportDirective", "scope": 16401, "sourceUnit": 13922, "src": "88:74:55", "symbolAliases": [ { "foreign": 15280, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol", "file": "@summa-tx/bitcoin-spv-sol/contracts/BytesLib.sol", "id": 15283, "nodeType": "ImportDirective", "scope": 16401, "sourceUnit": 13433, "src": "163:74:55", "symbolAliases": [ { "foreign": 15282, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol", "file": "@summa-tx/bitcoin-spv-sol/contracts/BTCUtils.sol", "id": 15285, "nodeType": "ImportDirective", "scope": 16401, "sourceUnit": 13217, "src": "238:74:55", "symbolAliases": [ { "foreign": 15284, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/bitcoin-spv-sol/contracts/ValidateSPV.sol", "file": "@summa-tx/bitcoin-spv-sol/contracts/ValidateSPV.sol", "id": 15287, "nodeType": "ImportDirective", "scope": 16401, "sourceUnit": 14208, "src": "313:80:55", "symbolAliases": [ { "foreign": 15286, "local": null } ], "unitAlias": "" }, { "absolutePath": "@summa-tx/relay-sol/contracts/Interfaces.sol", "file": "./Interfaces.sol", "id": 15289, "nodeType": "ImportDirective", "scope": 16401, "sourceUnit": 14394, "src": "394:40:55", "symbolAliases": [ { "foreign": 15288, "local": null } ], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 15290, "name": "IRelay", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 14393, "src": "454:6:55", "typeDescriptions": { "typeIdentifier": "t_contract$_IRelay_$14393", "typeString": "contract IRelay" } }, "id": 15291, "nodeType": "InheritanceSpecifier", "src": "454:6:55" } ], "contractDependencies": [ 14393 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 16343, "linearizedBaseContracts": [ 16343, 14393 ], "name": "Relay", "nodeType": "ContractDefinition", "nodes": [ { "id": 15294, "libraryName": { "contractScope": null, "id": 15292, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13921, "src": "473:8:55", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$13921", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "467:27:55", "typeName": { "id": 15293, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "486:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 15297, "libraryName": { "contractScope": null, "id": 15295, "name": "BytesLib", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13432, "src": "505:8:55", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesLib_$13432", "typeString": "library BytesLib" } }, "nodeType": "UsingForDirective", "src": "499:25:55", "typeName": { "id": 15296, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "518:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "id": 15300, "libraryName": { "contractScope": null, "id": 15298, "name": "BTCUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 13216, "src": "535:8:55", "typeDescriptions": { "typeIdentifier": "t_contract$_BTCUtils_$13216", "typeString": "library BTCUtils" } }, "nodeType": "UsingForDirective", "src": "529:25:55", "typeName": { "id": 15299, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "548:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "id": 15303, "libraryName": { "contractScope": null, "id": 15301, "name": "ValidateSPV", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 14207, "src": "565:11:55", "typeDescriptions": { "typeIdentifier": "t_contract$_ValidateSPV_$14207", "typeString": "library ValidateSPV" } }, "nodeType": "UsingForDirective", "src": "559:28:55", "typeName": { "id": 15302, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "581:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "constant": true, "id": 15306, "name": "HEIGHT_INTERVAL", "nodeType": "VariableDeclaration", "scope": 16343, "src": "704:42:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" }, "typeName": { "id": 15304, "name": "uint32", "nodeType": "ElementaryTypeName", "src": "704:6:55", "typeDescriptions": { "typeIdentifier": "t_uint32", "typeString": "uint32" } }, "value": { "argumentTypes": null, "hexValue": "34", "id": 15305, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "745:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_4_by_1", "typeString": "int_const 4" }, "value": "4" }, "visibility": "public" }, { "constant": false, "id": 15308, "name": "relayGenesis", "nodeType": "VariableDeclaration", "scope": 16343, "src": "753:29:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15307, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "753:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15310, "name": "bestKnownDigest", "nodeType": "VariableDeclaration", "scope": 16343, "src": "788:32:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15309, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "788:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15312, "name": "lastReorgCommonAncestor", "nodeType": "VariableDeclaration", "scope": 16343, "src": "826:40:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15311, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "826:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15316, "name": "previousBlock", "nodeType": "VariableDeclaration", "scope": 16343, "src": "872:51:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_bytes32_$", "typeString": "mapping(bytes32 => bytes32)" }, "typeName": { "id": 15315, "keyType": { "id": 15313, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "881:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Mapping", "src": "872:28:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_bytes32_$", "typeString": "mapping(bytes32 => bytes32)" }, "valueType": { "id": 15314, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "892:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15320, "name": "blockHeight", "nodeType": "VariableDeclaration", "scope": 16343, "src": "929:49:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_uint256_$", "typeString": "mapping(bytes32 => uint256)" }, "typeName": { "id": 15319, "keyType": { "id": 15317, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "938:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Mapping", "src": "929:28:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_uint256_$", "typeString": "mapping(bytes32 => uint256)" }, "valueType": { "id": 15318, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "949:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15322, "name": "currentEpochDiff", "nodeType": "VariableDeclaration", "scope": 16343, "src": "985:33:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15321, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "985:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15324, "name": "prevEpochDiff", "nodeType": "VariableDeclaration", "scope": 16343, "src": "1024:30:55", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15323, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1024:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "body": { "id": 15395, "nodeType": "Block", "src": "1515:653:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 15337, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 15334, "name": "_genesisHeader", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15326, "src": "1533:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 15335, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1533:21:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "3830", "id": 15336, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1558:2:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_80_by_1", "typeString": "int_const 80" }, "value": "80" }, "src": "1533:27:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "53746f70206265696e672064756d62", "id": 15338, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1562:17:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_54f9a5f9e9dfa58d8856435ba6e7418b795ac217ba9b784a12213c7ba6375b05", "typeString": "literal_string \"Stop being dumb\"" }, "value": "Stop being dumb" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_54f9a5f9e9dfa58d8856435ba6e7418b795ac217ba9b784a12213c7ba6375b05", "typeString": "literal_string \"Stop being dumb\"" } ], "id": 15333, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "1525:7:55", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 15339, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1525:55:55", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 15340, "nodeType": "ExpressionStatement", "src": "1525:55:55" }, { "assignments": [ 15342 ], "declarations": [ { "constant": false, "id": 15342, "name": "_genesisDigest", "nodeType": "VariableDeclaration", "scope": 15395, "src": "1590:22:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15341, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1590:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 15346, "initialValue": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { 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hash does not have work. Hint: wrong byte order?\"" }, "value": "Period start hash does not have work. Hint: wrong byte order?" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_c63e0adf63c0728a57e27fbecf3408104165ff577e498d3d8684c7fbae01d26d", "typeString": "literal_string \"Period start hash does not have work. Hint: wrong byte order?\"" } ], "id": 15347, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "1650:7:55", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 15358, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1650:203:55", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 15359, "nodeType": "ExpressionStatement", "src": "1650:203:55" }, { "expression": { "argumentTypes": null, "id": 15362, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15360, "name": "relayGenesis", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15308, "src": "1864:12:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 15361, "name": "_genesisDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15342, "src": "1879:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "1864:29:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "id": 15363, "nodeType": "ExpressionStatement", "src": "1864:29:55" }, { "expression": { "argumentTypes": null, "id": 15366, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15364, "name": "bestKnownDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15310, "src": "1903:15:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 15365, "name": "_genesisDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15342, "src": "1921:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "1903:32:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "id": 15367, "nodeType": "ExpressionStatement", "src": "1903:32:55" }, { "expression": { "argumentTypes": null, "id": 15370, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15368, "name": "lastReorgCommonAncestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15312, "src": "1945:23:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 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false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 15378, "name": "blockHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15320, "src": "2042:11:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_uint256_$", "typeString": "mapping(bytes32 => uint256)" } }, "id": 15380, "indexExpression": { "argumentTypes": null, "id": 15379, "name": "_periodStart", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15330, "src": "2054:12:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "2042:25:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 15385, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 15383, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15328, "src": "2082:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "%", "rightExpression": { "argumentTypes": null, "hexValue": "32303136", "id": 15384, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2092:4:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2016_by_1", "typeString": "int_const 2016" }, "value": "2016" }, "src": "2082:14:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 15381, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15328, "src": "2070:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15382, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sub", "nodeType": "MemberAccess", "referencedDeclaration": 13895, "src": "2070:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 15386, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2070:27:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2042:55:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15388, "nodeType": "ExpressionStatement", "src": "2042:55:55" }, { "expression": { "argumentTypes": null, "id": 15393, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15389, "name": "currentEpochDiff", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15322, "src": "2108:16:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 15390, "name": "_genesisHeader", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15326, "src": "2127:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 15391, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "extractDifficulty", "nodeType": "MemberAccess", "referencedDeclaration": 12998, "src": "2127:32:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_uint256_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (uint256)" } }, "id": 15392, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2127:34:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2108:53:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15394, "nodeType": "ExpressionStatement", "src": "2108:53:55" } ] }, "documentation": "@notice Gives a starting point for the relay\n @dev We don't check this AT ALL really. Don't use relays with bad genesis\n @param _genesisHeader The starting header\n @param _height The starting height\n @param _periodStart The hash of the first header in the genesis epoch", "id": 15396, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nodeType": "FunctionDefinition", "parameters": { "id": 15331, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15326, "name": "_genesisHeader", "nodeType": "VariableDeclaration", "scope": 15396, "src": "1440:27:55", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 15325, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1440:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15328, "name": "_height", "nodeType": "VariableDeclaration", "scope": 15396, "src": "1469:15:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15327, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1469:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15330, "name": "_periodStart", "nodeType": "VariableDeclaration", "scope": 15396, "src": "1486:20:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15329, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1486:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "1439:68:55" }, "returnParameters": { "id": 15332, "nodeType": "ParameterList", "parameters": [], "src": "1515:0:55" }, "scope": 16343, "src": "1428:740:55", "stateMutability": "nonpayable", "superFunction": null, "visibility": "public" }, { "body": { "id": 15403, "nodeType": "Block", "src": "2426:40:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15401, "name": "currentEpochDiff", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15322, "src": "2443:16:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 15400, "id": 15402, "nodeType": "Return", "src": "2436:23:55" } ] }, "documentation": "@notice Getter for currentEpochDiff\n @dev This is updated when a new heavist header has a new diff\n @return The difficulty of the bestKnownDigest", "id": 15404, "implemented": true, "kind": "function", "modifiers": [], "name": "getCurrentEpochDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 15397, "nodeType": "ParameterList", "parameters": [], "src": "2391:2:55" }, "returnParameters": { "id": 15400, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15399, "name": "", "nodeType": "VariableDeclaration", "scope": 15404, "src": "2417:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15398, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2417:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "2416:9:55" }, "scope": 16343, "src": "2357:109:55", "stateMutability": "view", "superFunction": 14312, "visibility": "external" }, { "body": { "id": 15411, "nodeType": "Block", "src": "2712:37:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15409, "name": "prevEpochDiff", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15324, "src": "2729:13:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 15408, "id": 15410, "nodeType": "Return", "src": "2722:20:55" } ] }, "documentation": "@notice Getter for prevEpochDiff\n @dev This is updated when a difficulty change is accepted\n @return The difficulty of the previous epoch", "id": 15412, "implemented": true, "kind": "function", "modifiers": [], "name": "getPrevEpochDifficulty", "nodeType": "FunctionDefinition", "parameters": { "id": 15405, "nodeType": "ParameterList", "parameters": [], "src": "2677:2:55" }, "returnParameters": { "id": 15408, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15407, "name": "", "nodeType": "VariableDeclaration", "scope": 15412, "src": "2703:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15406, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2703:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "2702:9:55" }, "scope": 16343, "src": "2646:103:55", "stateMutability": "view", "superFunction": 14317, "visibility": "external" }, { "body": { "id": 15419, "nodeType": "Block", "src": "2973:36:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15417, "name": "relayGenesis", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15308, "src": "2990:12:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 15416, "id": 15418, "nodeType": "Return", "src": "2983:19:55" } ] }, "documentation": "@notice Getter for relayGenesis\n @dev This is an initialization parameter\n @return The hash of the first block of the relay", "id": 15420, "implemented": true, "kind": "function", "modifiers": [], "name": "getRelayGenesis", "nodeType": "FunctionDefinition", "parameters": { "id": 15413, "nodeType": "ParameterList", "parameters": [], "src": "2940:2:55" }, "returnParameters": { "id": 15416, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15415, "name": "", "nodeType": "VariableDeclaration", "scope": 15420, "src": "2964:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15414, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "2964:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "2963:9:55" }, "scope": 16343, "src": "2916:93:55", "stateMutability": "view", "superFunction": 14322, "visibility": "public" }, { "body": { "id": 15427, "nodeType": "Block", "src": "3245:39:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15425, "name": "bestKnownDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15310, "src": "3262:15:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 15424, "id": 15426, "nodeType": "Return", "src": "3255:22:55" } ] }, "documentation": "@notice Getter for bestKnownDigest\n @dev This updated only by calling markNewHeaviest\n @return The hash of the best marked chain tip", "id": 15428, "implemented": true, "kind": "function", "modifiers": [], "name": "getBestKnownDigest", "nodeType": "FunctionDefinition", "parameters": { "id": 15421, "nodeType": "ParameterList", "parameters": [], "src": "3212:2:55" }, "returnParameters": { "id": 15424, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15423, "name": "", "nodeType": "VariableDeclaration", "scope": 15428, "src": "3236:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15422, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3236:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3235:9:55" }, "scope": 16343, "src": "3185:99:55", "stateMutability": "view", "superFunction": 14327, "visibility": "public" }, { "body": { "id": 15435, "nodeType": "Block", "src": "3546:47:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15433, "name": "lastReorgCommonAncestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15312, "src": "3563:23:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 15432, "id": 15434, "nodeType": "Return", "src": "3556:30:55" } ] }, "documentation": "@notice Getter for relayGenesis\n @dev This is updated only by calling markNewHeaviest\n @return The hash of the shared ancestor of the most recent fork", "id": 15436, "implemented": true, "kind": "function", "modifiers": [], "name": "getLastReorgCommonAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 15429, "nodeType": "ParameterList", "parameters": [], "src": "3513:2:55" }, "returnParameters": { "id": 15432, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15431, "name": "", "nodeType": "VariableDeclaration", "scope": 15436, "src": "3537:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15430, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3537:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3536:9:55" }, "scope": 16343, "src": "3478:115:55", "stateMutability": "view", "superFunction": 14332, "visibility": "public" }, { "body": { "id": 15447, "nodeType": "Block", "src": "3920:44:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15444, "name": "_digest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15438, "src": "3949:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 15443, "name": "_findHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15905, "src": "3937:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_uint256_$", "typeString": "function (bytes32) view returns (uint256)" } }, "id": 15445, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3937:20:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 15442, "id": 15446, "nodeType": "Return", "src": "3930:27:55" } ] }, "documentation": "@notice Finds the height of a header by its digest\n @dev Will fail if the header is unknown\n @param _digest The header digest to search for\n @return The height of the header, or error if unknown", "id": 15448, "implemented": true, "kind": "function", "modifiers": [], "name": "findHeight", "nodeType": "FunctionDefinition", "parameters": { "id": 15439, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15438, "name": "_digest", "nodeType": "VariableDeclaration", "scope": 15448, "src": "3871:15:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15437, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3871:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3870:17:55" }, "returnParameters": { "id": 15442, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15441, "name": "", "nodeType": "VariableDeclaration", "scope": 15448, "src": "3911:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15440, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3911:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "3910:9:55" }, "scope": 16343, "src": "3851:113:55", "stateMutability": "view", "superFunction": 14339, "visibility": "external" }, { "body": { "id": 15462, "nodeType": "Block", "src": "4311:55:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15458, "name": "_digest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15450, "src": "4342:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 15459, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15452, "src": "4351:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 15457, "name": "_findAncestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15952, "src": "4328:13:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_bytes32_$_t_uint256_$returns$_t_bytes32_$", "typeString": "function (bytes32,uint256) view returns (bytes32)" } }, "id": 15460, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4328:31:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 15456, "id": 15461, "nodeType": "Return", "src": "4321:38:55" } ] }, "documentation": "@notice Finds an ancestor for a block by its digest\n @dev Will fail if the header is unknown\n @param _digest The header digest to search for\n @return The height of the header, or error if unknown", "id": 15463, "implemented": true, "kind": "function", "modifiers": [], "name": "findAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 15453, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15450, "name": "_digest", "nodeType": "VariableDeclaration", "scope": 15463, "src": "4245:15:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15449, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4245:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15452, "name": "_offset", "nodeType": "VariableDeclaration", "scope": 15463, "src": "4262:15:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15451, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4262:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "4244:34:55" }, "returnParameters": { "id": 15456, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15455, "name": "", "nodeType": "VariableDeclaration", "scope": 15463, "src": "4302:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15454, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4302:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "4301:9:55" }, "scope": 16343, "src": "4223:143:55", "stateMutability": "view", "superFunction": 14348, "visibility": "external" }, { "body": { "id": 15480, "nodeType": "Block", "src": "4926:67:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15475, "name": "_ancestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15465, "src": "4955:9:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 15476, "name": "_descendant", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15467, "src": "4966:11:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 15477, "name": "_limit", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15469, "src": "4979:6:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 15474, "name": "_isAncestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15999, "src": "4943:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_bytes32_$_t_bytes32_$_t_uint256_$returns$_t_bool_$", "typeString": "function (bytes32,bytes32,uint256) view returns (bool)" } }, "id": 15478, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4943:43:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 15473, "id": 15479, "nodeType": "Return", "src": "4936:50:55" } ] }, "documentation": "@notice Checks if a digest is an ancestor of the current one\n @dev Limit the amount of lookups (and thus gas usage) with _limit\n @param _ancestor The prospective ancestor\n @param _descendant The descendant to check\n @param _limit The maximum number of blocks to check\n @return true if ancestor is at most limit blocks lower than descendant, otherwise false", "id": 15481, "implemented": true, "kind": "function", "modifiers": [], "name": "isAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 15470, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15465, "name": "_ancestor", "nodeType": "VariableDeclaration", "scope": 15481, "src": "4841:17:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15464, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4841:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15467, "name": "_descendant", "nodeType": "VariableDeclaration", "scope": 15481, "src": "4860:19:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15466, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4860:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15469, "name": "_limit", "nodeType": "VariableDeclaration", "scope": 15481, "src": "4881:14:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15468, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4881:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "4840:56:55" }, "returnParameters": { "id": 15473, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15472, "name": "", "nodeType": "VariableDeclaration", "scope": 15481, "src": "4920:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 15471, "name": "bool", "nodeType": "ElementaryTypeName", "src": "4920:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "4919:6:55" }, "scope": 16343, "src": "4821:172:55", "stateMutability": "view", "superFunction": 14359, "visibility": "external" }, { "body": { "id": 15496, "nodeType": "Block", "src": "5471:61:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15491, "name": "_anchor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15483, "src": "5500:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } }, { "argumentTypes": null, "id": 15492, "name": "_headers", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15485, "src": "5509:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } }, { "argumentTypes": null, "hexValue": "66616c7365", "id": 15493, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "5519:5:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" }, { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" }, { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 15490, "name": "_addHeaders", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15717, "src": "5488:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_bytes_memory_ptr_$_t_bytes_memory_ptr_$_t_bool_$returns$_t_bool_$", "typeString": "function (bytes memory,bytes memory,bool) returns (bool)" } }, "id": 15494, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5488:37:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 15489, "id": 15495, "nodeType": "Return", "src": "5481:44:55" } ] }, "documentation": "@notice Adds headers to storage after validating\n @dev We check integrity and consistency of the header chain\n @param _anchor The header immediately preceeding the new chain\n @param _headers A tightly-packed list of 80-byte Bitcoin headers\n @return True if successfully written, error otherwise", "id": 15497, "implemented": true, "kind": "function", "modifiers": [], "name": "addHeaders", "nodeType": "FunctionDefinition", "parameters": { "id": 15486, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15483, "name": "_anchor", "nodeType": "VariableDeclaration", "scope": 15497, "src": "5398:22:55", "stateVariable": false, "storageLocation": "calldata", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes" }, "typeName": { "id": 15482, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5398:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15485, "name": "_headers", "nodeType": "VariableDeclaration", "scope": 15497, "src": "5422:23:55", "stateVariable": false, "storageLocation": "calldata", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes" }, "typeName": { "id": 15484, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "5422:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "5397:49:55" }, "returnParameters": { "id": 15489, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15488, "name": "", "nodeType": "VariableDeclaration", "scope": 15497, "src": "5465:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 15487, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5465:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "5464:6:55" }, "scope": 16343, "src": "5378:154:55", "stateMutability": "nonpayable", "superFunction": 14368, "visibility": "external" }, { "body": { "id": 15514, "nodeType": "Block", "src": "6273:101:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15509, "name": "_oldPeriodStartHeader", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15499, "src": "6314:21:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } }, { "argumentTypes": null, "id": 15510, "name": "_oldPeriodEndHeader", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15501, "src": "6337:19:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } }, { "argumentTypes": null, "id": 15511, "name": "_headers", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15503, "src": "6358:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" }, { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" }, { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 15508, "name": "_addHeadersWithRetarget", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15844, "src": "6290:23:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_bytes_memory_ptr_$_t_bytes_memory_ptr_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (bytes memory,bytes memory,bytes memory) returns (bool)" } }, "id": 15512, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6290:77:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 15507, "id": 15513, "nodeType": "Return", "src": "6283:84:55" } ] }, "documentation": "@notice Adds headers to storage, performs additional validation of retarget\n @dev Checks the retarget, the heights, and the linkage\n @param _oldPeriodStartHeader The first header in the difficulty period being closed\n @param _oldPeriodEndHeader The last header in the difficulty period being closed\n @param _headers A tightly-packed list of 80-byte Bitcoin headers\n @return True if successfully written, error otherwise", "id": 15515, "implemented": true, "kind": "function", "modifiers": [], "name": "addHeadersWithRetarget", "nodeType": "FunctionDefinition", "parameters": { "id": 15504, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15499, "name": "_oldPeriodStartHeader", "nodeType": "VariableDeclaration", "scope": 15515, "src": "6129:36:55", "stateVariable": false, "storageLocation": "calldata", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes" }, "typeName": { "id": 15498, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6129:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15501, "name": "_oldPeriodEndHeader", "nodeType": "VariableDeclaration", "scope": 15515, "src": "6175:34:55", "stateVariable": false, "storageLocation": "calldata", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes" }, "typeName": { "id": 15500, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6175:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15503, "name": "_headers", "nodeType": "VariableDeclaration", "scope": 15515, "src": "6219:23:55", "stateVariable": false, "storageLocation": "calldata", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes" }, "typeName": { "id": 15502, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "6219:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "6119:129:55" }, "returnParameters": { "id": 15507, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15506, "name": "", "nodeType": "VariableDeclaration", "scope": 15515, "src": "6267:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 15505, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6267:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "6266:6:55" }, "scope": 16343, "src": "6088:286:55", "stateMutability": "nonpayable", "superFunction": 14379, "visibility": 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"Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15721, "src": "12514:19:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 15839, "name": "_headers", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15723, "src": "12535:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "hexValue": "74727565", "id": 15840, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "12545:4:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 15837, "name": "_addHeaders", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15717, "src": "12502:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_bytes_memory_ptr_$_t_bytes_memory_ptr_$_t_bool_$returns$_t_bool_$", "typeString": "function (bytes memory,bytes memory,bool) returns (bool)" } }, "id": 15841, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12502:48:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 15727, "id": 15842, "nodeType": "Return", "src": "12495:55:55" } ] }, "documentation": "@notice Adds headers to storage, performs additional validation of retarget\n @dev Checks the retarget, the heights, and the linkage\n @param _oldPeriodStartHeader The first header in the difficulty period being closed\n @param _oldPeriodEndHeader The last header in the difficulty period being closed\n @param _headers A tightly-packed list of 80-byte Bitcoin headers\n @return True if successfully written, error otherwise", "id": 15844, "implemented": true, "kind": "function", "modifiers": [], "name": "_addHeadersWithRetarget", "nodeType": "FunctionDefinition", "parameters": { "id": 15724, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15719, "name": "_oldPeriodStartHeader", "nodeType": "VariableDeclaration", "scope": 15844, "src": "10604:34:55", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 15718, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "10604:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15721, "name": "_oldPeriodEndHeader", "nodeType": "VariableDeclaration", "scope": 15844, "src": "10648:32:55", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 15720, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "10648:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15723, "name": "_headers", "nodeType": "VariableDeclaration", "scope": 15844, "src": "10690:21:55", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 15722, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "10690:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "10594:123:55" }, "returnParameters": { "id": 15727, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15726, "name": "", "nodeType": "VariableDeclaration", "scope": 15844, "src": "10736:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 15725, "name": "bool", "nodeType": "ElementaryTypeName", "src": "10736:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "10735:6:55" }, "scope": 16343, "src": "10562:1995:55", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" }, { "body": { "id": 15904, "nodeType": "Block", "src": "12864:387:55", "statements": [ { "assignments": [ 15852 ], "declarations": [ { "constant": false, "id": 15852, "name": "_height", "nodeType": "VariableDeclaration", "scope": 15904, "src": "12874:15:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15851, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12874:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 15854, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 15853, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12892:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "12874:19:55" }, { "assignments": [ 15856 ], "declarations": [ { "constant": false, "id": 15856, "name": "_current", "nodeType": "VariableDeclaration", "scope": 15904, "src": "12903:16:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15855, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "12903:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 15858, "initialValue": { "argumentTypes": null, "id": 15857, "name": "_digest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15846, "src": "12922:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "VariableDeclarationStatement", "src": "12903:26:55" }, { "body": { "id": 15898, "nodeType": "Block", "src": "12998:214:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15879, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15875, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15852, "src": "13012:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 15876, "name": "blockHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15320, "src": "13022:11:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_uint256_$", "typeString": "mapping(bytes32 => uint256)" } }, "id": 15878, "indexExpression": { "argumentTypes": null, "id": 15877, "name": "_current", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15856, "src": "13034:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13022:21:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13012:31:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15880, "nodeType": "ExpressionStatement", "src": "13012:31:55" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 15883, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 15881, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15852, "src": "13061:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 15882, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13072:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "13061:12:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": { "id": 15896, "nodeType": "Block", "src": "13148:54:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 15893, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15860, "src": "13185:1:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 15891, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15852, "src": "13173:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15892, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 13920, "src": "13173:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 15894, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13173:14:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 15850, "id": 15895, "nodeType": "Return", "src": "13166:21:55" } ] }, "id": 15897, "nodeType": "IfStatement", "src": "13057:145:55", "trueBody": { "id": 15890, "nodeType": "Block", "src": "13075:67:55", "statements": [ { "expression": { "argumentTypes": null, "id": 15888, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 15884, "name": "_current", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15856, "src": "13093:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 15885, "name": "previousBlock", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15316, "src": "13104:13:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_bytes32_$", "typeString": "mapping(bytes32 => bytes32)" } }, "id": 15887, "indexExpression": { "argumentTypes": null, "id": 15886, "name": "_current", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15856, "src": "13118:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": 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"typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15845, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "12815:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "12814:17:55" }, "returnParameters": { "id": 15850, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15849, "name": "", "nodeType": "VariableDeclaration", "scope": 15905, "src": "12855:7:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15848, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12855:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "12854:9:55" }, "scope": 16343, "src": "12794:457:55", "stateMutability": "view", "superFunction": null, "visibility": 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"typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 15923, "name": "_offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15909, "src": "13669:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "13665:11:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 15939, "initializationExpression": { "assignments": [ 15919 ], "declarations": [ { "constant": false, "id": 15919, "name": "i", "nodeType": "VariableDeclaration", "scope": 15939, "src": "13650:9:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15918, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13650:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": 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"typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 15943, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13788:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 15942, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13780:7:55", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes32_$", "typeString": "type(bytes32)" }, "typeName": "bytes32" }, "id": 15944, "isConstant": false, "isLValue": false, "isPure": true, "kind": 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} ], "id": 15940, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "13760:7:55", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 15947, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13760:51:55", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 15948, "nodeType": "ExpressionStatement", "src": "13760:51:55" }, { "expression": { "argumentTypes": null, "id": 15949, "name": "_current", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15915, "src": "13828:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 15913, "id": 15950, "nodeType": "Return", 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}, "src": "14539:10:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 15995, "initializationExpression": { "assignments": [ 15968 ], "declarations": [ { "constant": false, "id": 15968, "name": "i", "nodeType": "VariableDeclaration", "scope": 15995, "src": "14524:9:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15967, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14524:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 15970, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 15969, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14536:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": 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"typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" } ], "expression": { "argumentTypes": null, "id": 15975, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15968, "src": "14555:1:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15976, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 13920, "src": "14555:5:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 15978, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14555:8:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "14551:12:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 15980, "nodeType": "ExpressionStatement", "src": "14551:12:55" }, "nodeType": "ForStatement", "src": "14519:189:55" }, { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 15996, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "14724:5:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 15962, "id": 15997, "nodeType": "Return", "src": "14717:12:55" } ] }, "documentation": "@notice Checks if a digest is an ancestor of the current one\n @dev Limit the amount of lookups (and thus gas usage) with _limit\n @param _ancestor The prospective ancestor\n @param _descendant The descendant to check\n @param _limit The maximum number of blocks to check\n @return true if ancestor is at most limit blocks lower than descendant, otherwise false", "id": 15999, "implemented": true, "kind": "function", "modifiers": [], "name": "_isAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 15959, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15954, "name": "_ancestor", "nodeType": "VariableDeclaration", "scope": 15999, "src": "14319:17:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15953, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "14319:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15956, "name": "_descendant", "nodeType": "VariableDeclaration", "scope": 15999, "src": "14338:19:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 15955, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "14338:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 15958, "name": "_limit", "nodeType": "VariableDeclaration", "scope": 15999, "src": "14359:14:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 15957, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14359:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "14318:56:55" }, "returnParameters": { "id": 15962, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 15961, "name": "", "nodeType": "VariableDeclaration", "scope": 15999, "src": "14398:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 15960, "name": "bool", "nodeType": "ElementaryTypeName", "src": "14398:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "14397:6:55" }, "scope": 16343, "src": "14298:438:55", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 16101, "nodeType": "Block", "src": "15397:1114:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 16015, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 16013, "name": "_limit", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16007, "src": "15415:6:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<=", "rightExpression": { "argumentTypes": null, "hexValue": "32303136", "id": 16014, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "15425:4:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_2016_by_1", "typeString": "int_const 2016" }, "value": "2016" }, "src": "15415:14:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "526571756573746564206c696d69742069732067726561746572207468616e203120646966666963756c747920706572696f64", "id": 16016, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "15431:53:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_34b0e8aa7e872c1823abee92749e80e1aaaa8c704daa024b6296520f08dccd95", "typeString": "literal_string \"Requested limit is greater than 1 difficulty period\"" }, "value": "Requested limit is greater than 1 difficulty period" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_34b0e8aa7e872c1823abee92749e80e1aaaa8c704daa024b6296520f08dccd95", "typeString": "literal_string \"Requested limit is greater than 1 difficulty period\"" } ], "id": 16012, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "15407:7:55", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 16017, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15407:78:55", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 16018, "nodeType": "ExpressionStatement", "src": "15407:78:55" }, { "assignments": [ 16020 ], "declarations": [ { "constant": false, "id": 16020, "name": "_newBestDigest", "nodeType": "VariableDeclaration", "scope": 16101, "src": "15495:22:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16019, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "15495:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 16024, "initialValue": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16021, "name": "_newBest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16005, "src": "15520:8:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 16022, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "hash256", "nodeType": "MemberAccess", "referencedDeclaration": 11851, "src": "15520:16:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 16023, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15520:18:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "VariableDeclarationStatement", "src": "15495:43:55" }, { "assignments": [ 16026 ], "declarations": [ { "constant": false, "id": 16026, "name": "_currentBestDigest", "nodeType": "VariableDeclaration", "scope": 16101, "src": "15548:26:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16025, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "15548:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 16030, "initialValue": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16027, "name": "_currentBest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16003, "src": "15577:12:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 16028, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "hash256", "nodeType": "MemberAccess", "referencedDeclaration": 11851, "src": "15577:20:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 16029, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15577:22:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "VariableDeclarationStatement", "src": "15548:51:55" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 16034, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 16032, "name": "_currentBestDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16026, "src": "15617:18:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 16033, "name": "bestKnownDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15310, "src": "15639:15:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "15617:37:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "50617373656420696e2062657374206973206e6f742062657374206b6e6f776e", "id": 16035, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "15656:34:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_08d40782ec860529d1a49d4deccf329d686c48a4affb967e8f3fe896477d9012", "typeString": "literal_string \"Passed in best is not best known\"" }, "value": "Passed in best is not best known" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_08d40782ec860529d1a49d4deccf329d686c48a4affb967e8f3fe896477d9012", "typeString": "literal_string \"Passed in best is not best known\"" } ], "id": 16031, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 18363, 18364 ], "referencedDeclaration": 18364, "src": "15609:7:55", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 16036, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15609:82:55", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 16037, "nodeType": "ExpressionStatement", "src": "15609:82:55" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 16045, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 16039, "name": "previousBlock", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15316, "src": "15722:13:55", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_bytes32_$_t_bytes32_$", "typeString": "mapping(bytes32 => bytes32)" } }, "id": 16041, "indexExpression": { "argumentTypes": null, "id": 16040, "name": "_newBestDigest", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16020, "src": "15736:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "15722:29:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 16043, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "15763:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 16042, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "15755:7:55", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes32_$", "typeString": "type(bytes32)" }, "typeName": "bytes32" }, "id": 16044, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15755:10:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "15722:43:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4e6577206265737420697320756e6b6e6f776e", "id": 16046, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "15779:21:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_21175d40c2ebef79a732817277d464b099ad41722534bb4c1a81ec30c878b42d", "typeString": "literal_string \"New best is unknown\"" }, "value": "New best is unknown" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_21175d40c2ebef79a732817277d464b099ad41722534bb4c1a81ec30c878b42d", "typeString": "literal_string 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"typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "id": 16147, "name": "_limit", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16110, "src": "17470:6:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "17466:10:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 16187, "initializationExpression": { "assignments": [ 16143 ], "declarations": [ { "constant": false, "id": 16143, "name": "i", "nodeType": "VariableDeclaration", "scope": 16187, "src": "17451:9:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 16142, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "17451:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 16145, "initialValue": { "argumentTypes": null, "hexValue": "30", "id": 16144, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "17463:1:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "nodeType": "VariableDeclarationStatement", "src": "17451:13:55" }, "loopExpression": { "expression": { "argumentTypes": null, "id": 16154, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 16149, "name": "i", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16143, "src": "17478:1:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { 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"typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 16114, "id": 16192, "nodeType": "Return", "src": "17905:12:55" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "id": 16197, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 16195, "name": "_leftPrev", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16135, "src": "17981:9:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "id": 16196, "name": "_rightPrev", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16139, "src": "17994:10:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "src": "17981:23:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 16201, "nodeType": "IfStatement", "src": "17977:44:55", "trueBody": { "id": 16200, "nodeType": "Block", "src": "18006:15:55", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "66616c7365", "id": 16198, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "18014:5:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "functionReturnParameters": 16114, "id": 16199, "nodeType": "Return", "src": "18007:12:55" } ] } }, { "expression": { "argumentTypes": null, "hexValue": "74727565", "id": 16202, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "18069:4:55", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 16114, "id": 16203, "nodeType": "Return", "src": "18062:11:55" } ] }, "documentation": "@notice Checks if a digest is an ancestor of the current one\n @dev Limit the amount of lookups (and thus gas usage) with _limit\n @param _ancestor The prospective shared ancestor\n @param _left A chain tip\n @param _right A chain tip\n @param _limit The maximum number of blocks to check\n @return true if it is the most recent common ancestor within _limit, false otherwise", "id": 16205, "implemented": true, "kind": "function", "modifiers": [], "name": "_isMostRecentAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 16111, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 16104, "name": "_ancestor", "nodeType": "VariableDeclaration", "scope": 16205, "src": "17038:17:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16103, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "17038:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 16106, "name": "_left", "nodeType": "VariableDeclaration", "scope": 16205, "src": "17065:13:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16105, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "17065:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 16108, "name": "_right", "nodeType": "VariableDeclaration", "scope": 16205, "src": "17088:14:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16107, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "17088:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 16110, "name": "_limit", "nodeType": "VariableDeclaration", "scope": 16205, "src": "17112:14:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 16109, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "17112:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "17028:104:55" }, "returnParameters": { "id": 16114, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 16113, "name": "", "nodeType": "VariableDeclaration", "scope": 16205, "src": "17156:4:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 16112, "name": "bool", "nodeType": "ElementaryTypeName", "src": "17156:4:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "17155:6:55" }, "scope": 16343, "src": "16998:1082:55", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 16341, "nodeType": "Block", "src": "18636:1615:55", "statements": [ { "assignments": [ 16217 ], "declarations": [ { "constant": false, "id": 16217, "name": "_ancestorHeight", "nodeType": "VariableDeclaration", "scope": 16341, "src": "18646:23:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 16216, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "18646:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 16221, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 16219, "name": "_ancestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16207, "src": "18684:9:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 16218, "name": "_findHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15905, "src": "18672:11:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_uint256_$", "typeString": "function (bytes32) view returns (uint256)" } }, "id": 16220, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "18672:22:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "18646:48:55" }, { "assignments": [ 16223 ], "declarations": [ { "constant": false, "id": 16223, "name": "_leftHeight", "nodeType": "VariableDeclaration", "scope": 16341, "src": "18704:19:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 16222, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "18704:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 16229, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16225, "name": "_left", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16209, "src": "18738:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 16226, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "hash256", "nodeType": "MemberAccess", "referencedDeclaration": 11851, "src": "18738:13:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 16227, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "18738:15:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 16224, "name": "_findHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15905, "src": "18726:11:55", 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"referencedDeclaration": 13860, "src": "20063:25:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 16326, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "20063:53:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19991:125:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": { "id": 16337, "nodeType": "Block", "src": "20180:55:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16333, "name": "_left", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16209, "src": "20205:5:55", 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"typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 16215, "id": 16331, "nodeType": "Return", "src": "20136:23:55" } ] } } ] }, "id": 16340, "nodeType": "IfStatement", "src": "19789:456:55", "trueBody": { "id": 16307, "nodeType": "Block", "src": "19826:96:55", "statements": [ { "expression": { "argumentTypes": null, "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 16298, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 16296, "name": "_leftHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16223, "src": "19847:11:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "argumentTypes": null, "id": 16297, "name": "_rightHeight", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16231, "src": "19862:12:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "19847:27:55", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseExpression": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16302, "name": "_right", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16211, "src": "19895:6:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 16303, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "hash256", "nodeType": "MemberAccess", "referencedDeclaration": 11851, "src": "19895:14:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 16304, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "19895:16:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "id": 16305, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "Conditional", "src": "19847:64:55", "trueExpression": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 16299, "name": "_left", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16209, "src": "19877:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 16300, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "hash256", "nodeType": "MemberAccess", "referencedDeclaration": 11851, "src": "19877:13:55", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 16301, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "19877:15:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 16215, "id": 16306, "nodeType": "Return", "src": "19840:71:55" } ] } } ] }, "documentation": "@notice Decides which header is heaviest from the ancestor\n @dev Does not support reorgs above 2017 blocks (:\n @param _ancestor The prospective shared ancestor\n @param _left A chain tip\n @param _right A chain tip\n @return true if it is the most recent common ancestor within _limit, false otherwise", "id": 16342, "implemented": true, "kind": "function", "modifiers": [], "name": "_heaviestFromAncestor", "nodeType": "FunctionDefinition", "parameters": { "id": 16212, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 16207, "name": "_ancestor", "nodeType": "VariableDeclaration", "scope": 16342, "src": "18523:17:55", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16206, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "18523:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 16209, "name": "_left", "nodeType": "VariableDeclaration", "scope": 16342, "src": "18550:18:55", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": 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"storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 16213, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "18627:7:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "18626:9:55" }, "scope": 16343, "src": "18483:1768:55", "stateMutability": "view", "superFunction": null, "visibility": "internal" } ], "scope": 16401, "src": "436:19817:55" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 16344, "name": "Relay", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 16343, "src": "20294:5:55", "typeDescriptions": { "typeIdentifier": "t_contract$_Relay_$16343", "typeString": "contract Relay" } }, "id": 16345, "nodeType": "InheritanceSpecifier", "src": "20294:5:55" } ], "contractDependencies": [ 14393, 16343 ], "contractKind": "contract", "documentation": null, 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Don't use relays with bad genesis\n @param _genesisHeader The starting header\n @param _height The starting height\n @param _periodStart The hash of the first header in the genesis epoch", "id": 16360, "implemented": true, "kind": "constructor", "modifiers": [ { "arguments": [ { "argumentTypes": null, "id": 16354, "name": "_genesisHeader", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16347, "src": "20767:14:55", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 16355, "name": "_height", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16349, "src": "20783:7:55", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 16356, "name": "_periodStart", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16351, "src": "20792:12:55", "typeDescriptions": { 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}, "value": null, "visibility": "internal" } ], "src": "20684:68:55" }, "returnParameters": { "id": 16358, "nodeType": "ParameterList", "parameters": [], "src": "20817:0:55" }, "scope": 16400, "src": "20673:146:55", "stateMutability": "nonpayable", "superFunction": null, "visibility": "public" }, { "body": { "id": 16377, "nodeType": "Block", "src": "20981:71:55", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 16372, "name": "_ancestor", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16362, "src": "21020:9:55", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 16373, "name": "_left", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 16364, "src": "21031:5:55", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } }, { "argumentTypes": null, "id": 16374, "name": 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