Source Code
Overview
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0.101030000034941456 ETH
Token Holdings
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Multichain Info
N/A
Latest 25 from a total of 13,484 transactions
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Revoke Offchain | 7658140 | 1 hr ago | IN | 0 ETH | 0.00453792 | ||||
Attest | 7657888 | 2 hrs ago | IN | 0 ETH | 0.01557952 | ||||
Attest | 7657887 | 2 hrs ago | IN | 0 ETH | 0.01542301 | ||||
Attest | 7657860 | 2 hrs ago | IN | 0 ETH | 0.00842507 | ||||
Attest | 7656260 | 7 hrs ago | IN | 0 ETH | 0.00461709 | ||||
Attest | 7655263 | 11 hrs ago | IN | 0 ETH | 0.00105899 | ||||
Attest | 7655068 | 12 hrs ago | IN | 0 ETH | 0.00045855 | ||||
Attest | 7654567 | 13 hrs ago | IN | 0 ETH | 0.00055288 | ||||
Attest | 7654564 | 13 hrs ago | IN | 0 ETH | 0.00053555 | ||||
Attest | 7653942 | 16 hrs ago | IN | 0 ETH | 0.00038801 | ||||
Revoke | 7653662 | 17 hrs ago | IN | 0 ETH | 0.0002052 | ||||
Attest | 7652990 | 19 hrs ago | IN | 0 ETH | 0.01372894 | ||||
Attest | 7652990 | 19 hrs ago | IN | 0 ETH | 0.01354269 | ||||
Attest | 7652610 | 20 hrs ago | IN | 0 ETH | 0.11543171 | ||||
Attest | 7652606 | 20 hrs ago | IN | 0 ETH | 0.10951744 | ||||
Attest | 7652457 | 21 hrs ago | IN | 0 ETH | 0.11352503 | ||||
Attest | 7649388 | 32 hrs ago | IN | 0 ETH | 0.00066366 | ||||
Attest | 7646707 | 41 hrs ago | IN | 0 ETH | 0.00415056 | ||||
Attest | 7646684 | 41 hrs ago | IN | 0 ETH | 0.00328372 | ||||
Attest | 7646681 | 41 hrs ago | IN | 0 ETH | 0.00370279 | ||||
Attest | 7646674 | 41 hrs ago | IN | 0 ETH | 0.00305313 | ||||
Attest | 7646667 | 41 hrs ago | IN | 0 ETH | 0.00307656 | ||||
Attest | 7646663 | 41 hrs ago | IN | 0 ETH | 0.00289328 | ||||
Attest | 7646174 | 43 hrs ago | IN | 0 ETH | 0.03255308 | ||||
Attest | 7645996 | 44 hrs ago | IN | 0 ETH | 0.0104465 |
Latest 25 internal transactions (View All)
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Contract Name:
EAS
Compiler Version
v0.8.18+commit.87f61d96
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.18; import { Address } from "@openzeppelin/contracts/utils/Address.sol"; import { EMPTY_UID, EIP712Signature } from "./Types.sol"; // prettier-ignore import { Attestation, AttestationRequest, AttestationRequestData, DelegatedAttestationRequest, DelegatedRevocationRequest, IEAS, MultiAttestationRequest, MultiDelegatedAttestationRequest, MultiDelegatedRevocationRequest, MultiRevocationRequest, RevocationRequest, RevocationRequestData } from "./IEAS.sol"; import { ISchemaRegistry, SchemaRecord } from "./ISchemaRegistry.sol"; import { EIP712Verifier } from "./EIP712Verifier.sol"; import { ISchemaResolver } from "./resolver/ISchemaResolver.sol"; struct AttestationsResult { uint256 usedValue; // Total ETH amount that was sent to resolvers. bytes32[] uids; // UIDs of the new attestations. } /** * @title EAS - Ethereum Attestation Service */ contract EAS is IEAS, EIP712Verifier { using Address for address payable; error AccessDenied(); error AlreadyRevoked(); error AlreadyRevokedOffchain(); error AlreadyTimestamped(); error InsufficientValue(); error InvalidAttestation(); error InvalidAttestations(); error InvalidExpirationTime(); error InvalidLength(); error InvalidOffset(); error InvalidRegistry(); error InvalidRevocation(); error InvalidRevocations(); error InvalidSchema(); error InvalidVerifier(); error Irrevocable(); error NotFound(); error NotPayable(); error WrongSchema(); // The version of the contract. string public constant VERSION = "0.26"; // A zero expiration represents an non-expiring attestation. uint64 private constant NO_EXPIRATION_TIME = 0; // The global schema registry. ISchemaRegistry private immutable _schemaRegistry; // The global mapping between attestations and their UIDs. mapping(bytes32 uid => Attestation attestation) private _db; // The global mapping between data and their timestamps. mapping(bytes32 data => uint64 timestamp) private _timestamps; // The global mapping between data and their revocation timestamps. mapping(address revoker => mapping(bytes32 data => uint64 timestamp)) private _revocationsOffchain; /** * @dev Creates a new EAS instance. * * @param registry The address of the global schema registry. */ constructor(ISchemaRegistry registry) EIP712Verifier(VERSION) { if (address(registry) == address(0)) { revert InvalidRegistry(); } _schemaRegistry = registry; } /** * @inheritdoc IEAS */ function getSchemaRegistry() external view returns (ISchemaRegistry) { return _schemaRegistry; } /** * @inheritdoc IEAS */ function attest(AttestationRequest calldata request) public payable virtual returns (bytes32) { AttestationRequestData[] memory requests = new AttestationRequestData[](1); requests[0] = request.data; return _attest(request.schema, requests, msg.sender, msg.value, true).uids[0]; } /** * @inheritdoc IEAS */ function attestByDelegation( DelegatedAttestationRequest calldata delegatedRequest ) public payable virtual returns (bytes32) { _verifyAttest(delegatedRequest); AttestationRequestData[] memory data = new AttestationRequestData[](1); data[0] = delegatedRequest.data; return _attest(delegatedRequest.schema, data, delegatedRequest.attester, msg.value, true).uids[0]; } /** * @inheritdoc IEAS */ function multiAttest(MultiAttestationRequest[] calldata multiRequests) external payable returns (bytes32[] memory) { // Since a multi-attest call is going to make multiple attestations for multiple schemas, we'd need to collect // all the returned UIDs into a single list. bytes32[][] memory totalUids = new bytes32[][](multiRequests.length); uint256 totalUidsCount = 0; // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be // possible to send too much ETH anyway. uint availableValue = msg.value; for (uint256 i = 0; i < multiRequests.length; ) { // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there // is a remainder - it will be refunded back to the attester (something that we can only verify during the // last and final batch). bool last; unchecked { last = i == multiRequests.length - 1; } // Process the current batch of attestations. MultiAttestationRequest calldata multiRequest = multiRequests[i]; AttestationsResult memory res = _attest( multiRequest.schema, multiRequest.data, msg.sender, availableValue, last ); // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch. availableValue -= res.usedValue; // Collect UIDs (and merge them later). totalUids[i] = res.uids; unchecked { totalUidsCount += res.uids.length; } unchecked { ++i; } } // Merge all the collected UIDs and return them as a flatten array. return _mergeUIDs(totalUids, totalUidsCount); } /** * @inheritdoc IEAS */ function multiAttestByDelegation( MultiDelegatedAttestationRequest[] calldata multiDelegatedRequests ) external payable returns (bytes32[] memory) { // Since a multi-attest call is going to make multiple attestations for multiple schemas, we'd need to collect // all the returned UIDs into a single list. bytes32[][] memory totalUids = new bytes32[][](multiDelegatedRequests.length); uint256 totalUidsCount = 0; // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be // possible to send too much ETH anyway. uint availableValue = msg.value; for (uint256 i = 0; i < multiDelegatedRequests.length; ) { // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there // is a remainder - it will be refunded back to the attester (something that we can only verify during the // last and final batch). bool last; unchecked { last = i == multiDelegatedRequests.length - 1; } MultiDelegatedAttestationRequest calldata multiDelegatedRequest = multiDelegatedRequests[i]; AttestationRequestData[] calldata data = multiDelegatedRequest.data; // Ensure that no inputs are missing. if (data.length == 0 || data.length != multiDelegatedRequest.signatures.length) { revert InvalidLength(); } // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces. for (uint256 j = 0; j < data.length; ) { _verifyAttest( DelegatedAttestationRequest({ schema: multiDelegatedRequest.schema, data: data[j], signature: multiDelegatedRequest.signatures[j], attester: multiDelegatedRequest.attester }) ); unchecked { ++j; } } // Process the current batch of attestations. AttestationsResult memory res = _attest( multiDelegatedRequest.schema, data, multiDelegatedRequest.attester, availableValue, last ); // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch. availableValue -= res.usedValue; // Collect UIDs (and merge them later). totalUids[i] = res.uids; unchecked { totalUidsCount += res.uids.length; } unchecked { ++i; } } // Merge all the collected UIDs and return them as a flatten array. return _mergeUIDs(totalUids, totalUidsCount); } /** * @inheritdoc IEAS */ function revoke(RevocationRequest calldata request) public payable virtual { RevocationRequestData[] memory requests = new RevocationRequestData[](1); requests[0] = request.data; _revoke(request.schema, requests, msg.sender, msg.value, true); } /** * @inheritdoc IEAS */ function revokeByDelegation(DelegatedRevocationRequest calldata delegatedRequest) public payable virtual { _verifyRevoke(delegatedRequest); RevocationRequestData[] memory data = new RevocationRequestData[](1); data[0] = delegatedRequest.data; _revoke(delegatedRequest.schema, data, delegatedRequest.revoker, msg.value, true); } /** * @inheritdoc IEAS */ function multiRevoke(MultiRevocationRequest[] calldata multiRequests) external payable { // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be // possible to send too much ETH anyway. uint availableValue = msg.value; for (uint256 i = 0; i < multiRequests.length; ) { // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there // is a remainder - it will be refunded back to the attester (something that we can only verify during the // last and final batch). bool last; unchecked { last = i == multiRequests.length - 1; } MultiRevocationRequest calldata multiRequest = multiRequests[i]; // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch. availableValue -= _revoke(multiRequest.schema, multiRequest.data, msg.sender, availableValue, last); unchecked { ++i; } } } /** * @inheritdoc IEAS */ function multiRevokeByDelegation( MultiDelegatedRevocationRequest[] calldata multiDelegatedRequests ) external payable { // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be // possible to send too much ETH anyway. uint availableValue = msg.value; for (uint256 i = 0; i < multiDelegatedRequests.length; ) { // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there // is a remainder - it will be refunded back to the attester (something that we can only verify during the // last and final batch). bool last; unchecked { last = i == multiDelegatedRequests.length - 1; } MultiDelegatedRevocationRequest memory multiDelegatedRequest = multiDelegatedRequests[i]; RevocationRequestData[] memory data = multiDelegatedRequest.data; // Ensure that no inputs are missing. if (data.length == 0 || data.length != multiDelegatedRequest.signatures.length) { revert InvalidLength(); } // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces. for (uint256 j = 0; j < data.length; ) { _verifyRevoke( DelegatedRevocationRequest({ schema: multiDelegatedRequest.schema, data: data[j], signature: multiDelegatedRequest.signatures[j], revoker: multiDelegatedRequest.revoker }) ); unchecked { ++j; } } // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch. availableValue -= _revoke( multiDelegatedRequest.schema, data, multiDelegatedRequest.revoker, availableValue, last ); unchecked { ++i; } } } /** * @inheritdoc IEAS */ function timestamp(bytes32 data) external returns (uint64) { uint64 time = _time(); _timestamp(data, time); return time; } /** * @inheritdoc IEAS */ function revokeOffchain(bytes32 data) external returns (uint64) { uint64 time = _time(); _revokeOffchain(msg.sender, data, time); return time; } /** * @inheritdoc IEAS */ function multiRevokeOffchain(bytes32[] calldata data) external returns (uint64) { uint64 time = _time(); uint256 length = data.length; for (uint256 i = 0; i < length; ) { _revokeOffchain(msg.sender, data[i], time); unchecked { ++i; } } return time; } /** * @inheritdoc IEAS */ function multiTimestamp(bytes32[] calldata data) external returns (uint64) { uint64 time = _time(); uint256 length = data.length; for (uint256 i = 0; i < length; ) { _timestamp(data[i], time); unchecked { ++i; } } return time; } /** * @inheritdoc IEAS */ function getAttestation(bytes32 uid) external view returns (Attestation memory) { return _db[uid]; } /** * @inheritdoc IEAS */ function isAttestationValid(bytes32 uid) public view returns (bool) { return _db[uid].uid != 0; } /** * @inheritdoc IEAS */ function getTimestamp(bytes32 data) external view returns (uint64) { return _timestamps[data]; } /** * @inheritdoc IEAS */ function getRevokeOffchain(address revoker, bytes32 data) external view returns (uint64) { return _revocationsOffchain[revoker][data]; } /** * @dev Attests to a specific schema. * * @param schema // the unique identifier of the schema to attest to. * @param data The arguments of the attestation requests. * @param attester The attesting account. * @param availableValue The total available ETH amount that can be sent to the resolver. * @param last Whether this is the last attestations/revocations set. * * @return The UID of the new attestations and the total sent ETH amount. */ function _attest( bytes32 schema, AttestationRequestData[] memory data, address attester, uint256 availableValue, bool last ) private returns (AttestationsResult memory) { uint256 length = data.length; AttestationsResult memory res; res.uids = new bytes32[](length); // Ensure that we aren't attempting to attest to a non-existing schema. SchemaRecord memory schemaRecord = _schemaRegistry.getSchema(schema); if (schemaRecord.uid == EMPTY_UID) { revert InvalidSchema(); } Attestation[] memory attestations = new Attestation[](length); uint256[] memory values = new uint256[](length); for (uint256 i = 0; i < length; ) { AttestationRequestData memory request = data[i]; // Ensure that either no expiration time was set or that it was set in the future. if (request.expirationTime != NO_EXPIRATION_TIME && request.expirationTime <= _time()) { revert InvalidExpirationTime(); } // Ensure that we aren't trying to make a revocable attestation for a non-revocable schema. if (!schemaRecord.revocable && request.revocable) { revert Irrevocable(); } Attestation memory attestation = Attestation({ uid: EMPTY_UID, schema: schema, refUID: request.refUID, time: _time(), expirationTime: request.expirationTime, revocationTime: 0, recipient: request.recipient, attester: attester, revocable: request.revocable, data: request.data }); // Look for the first non-existing UID (and use a bump seed/nonce in the rare case of a conflict). bytes32 uid; uint32 bump = 0; while (true) { uid = _getUID(attestation, bump); if (_db[uid].uid == EMPTY_UID) { break; } unchecked { ++bump; } } attestation.uid = uid; _db[uid] = attestation; if (request.refUID != 0) { // Ensure that we aren't trying to attest to a non-existing referenced UID. if (!isAttestationValid(request.refUID)) { revert NotFound(); } } attestations[i] = attestation; values[i] = request.value; res.uids[i] = uid; emit Attested(request.recipient, attester, uid, schema); unchecked { ++i; } } res.usedValue = _resolveAttestations(schemaRecord, attestations, values, false, availableValue, last); return res; } /** * @dev Revokes an existing attestation to a specific schema. * * @param schema The unique identifier of the schema to attest to. * @param data The arguments of the revocation requests. * @param revoker The revoking account. * @param availableValue The total available ETH amount that can be sent to the resolver. * @param last Whether this is the last attestations/revocations set. * * @return Returns the total sent ETH amount. */ function _revoke( bytes32 schema, RevocationRequestData[] memory data, address revoker, uint256 availableValue, bool last ) private returns (uint256) { // Ensure that a non-existing schema ID wasn't passed by accident. SchemaRecord memory schemaRecord = _schemaRegistry.getSchema(schema); if (schemaRecord.uid == EMPTY_UID) { revert InvalidSchema(); } uint256 length = data.length; Attestation[] memory attestations = new Attestation[](length); uint256[] memory values = new uint256[](length); for (uint256 i = 0; i < length; ) { RevocationRequestData memory request = data[i]; Attestation storage attestation = _db[request.uid]; // Ensure that we aren't attempting to revoke a non-existing attestation. if (attestation.uid == EMPTY_UID) { revert NotFound(); } // Ensure that a wrong schema ID wasn't passed by accident. if (attestation.schema != schema) { revert InvalidSchema(); } // Allow only original attesters to revoke their attestations. if (attestation.attester != revoker) { revert AccessDenied(); } // Please note that also checking of the schema itself is revocable is unnecessary, since it's not possible to // make revocable attestations to an irrevocable schema. if (!attestation.revocable) { revert Irrevocable(); } // Ensure that we aren't trying to revoke the same attestation twice. if (attestation.revocationTime != 0) { revert AlreadyRevoked(); } attestation.revocationTime = _time(); attestations[i] = attestation; values[i] = request.value; emit Revoked(attestation.recipient, revoker, request.uid, attestation.schema); unchecked { ++i; } } return _resolveAttestations(schemaRecord, attestations, values, true, availableValue, last); } /** * @dev Resolves a new attestation or a revocation of an existing attestation. * * @param schemaRecord The schema of the attestation. * @param attestation The data of the attestation to make/revoke. * @param value An explicit ETH amount to send to the resolver. * @param isRevocation Whether to resolve an attestation or its revocation. * @param availableValue The total available ETH amount that can be sent to the resolver. * @param last Whether this is the last attestations/revocations set. * * @return Returns the total sent ETH amount. */ function _resolveAttestation( SchemaRecord memory schemaRecord, Attestation memory attestation, uint256 value, bool isRevocation, uint256 availableValue, bool last ) private returns (uint256) { ISchemaResolver resolver = schemaRecord.resolver; if (address(resolver) == address(0)) { // Ensure that we don't accept payments if there is no resolver. if (value != 0) { revert NotPayable(); } return 0; } // Ensure that we don't accept payments which can't be forwarded to the resolver. if (value != 0 && !resolver.isPayable()) { revert NotPayable(); } // Ensure that the attester/revoker doesn't try to spend more than available. if (value > availableValue) { revert InsufficientValue(); } // Ensure to deduct the sent value explicitly. unchecked { availableValue -= value; } if (isRevocation) { if (!resolver.revoke{ value: value }(attestation)) { revert InvalidRevocation(); } } else if (!resolver.attest{ value: value }(attestation)) { revert InvalidAttestation(); } if (last) { _refund(availableValue); } return value; } /** * @dev Resolves multiple attestations or revocations of existing attestations. * * @param schemaRecord The schema of the attestation. * @param attestations The data of the attestations to make/revoke. * @param values Explicit ETH amounts to send to the resolver. * @param isRevocation Whether to resolve an attestation or its revocation. * @param availableValue The total available ETH amount that can be sent to the resolver. * @param last Whether this is the last attestations/revocations set. * * @return Returns the total sent ETH amount. */ function _resolveAttestations( SchemaRecord memory schemaRecord, Attestation[] memory attestations, uint256[] memory values, bool isRevocation, uint256 availableValue, bool last ) private returns (uint256) { uint256 length = attestations.length; if (length == 1) { return _resolveAttestation(schemaRecord, attestations[0], values[0], isRevocation, availableValue, last); } ISchemaResolver resolver = schemaRecord.resolver; if (address(resolver) == address(0)) { // Ensure that we don't accept payments if there is no resolver. for (uint256 i = 0; i < length; ) { if (values[i] != 0) { revert NotPayable(); } unchecked { ++i; } } return 0; } uint256 totalUsedValue = 0; for (uint256 i = 0; i < length; ) { uint256 value = values[i]; // Ensure that we don't accept payments which can't be forwarded to the resolver. if (value != 0 && !resolver.isPayable()) { revert NotPayable(); } // Ensure that the attester/revoker doesn't try to spend more than available. if (value > availableValue) { revert InsufficientValue(); } // Ensure to deduct the sent value explicitly and add it to the total used value by the batch. unchecked { availableValue -= value; totalUsedValue += value; ++i; } } if (isRevocation) { if (!resolver.multiRevoke{ value: totalUsedValue }(attestations, values)) { revert InvalidRevocations(); } } else if (!resolver.multiAttest{ value: totalUsedValue }(attestations, values)) { revert InvalidAttestations(); } if (last) { _refund(availableValue); } return totalUsedValue; } /** * @dev Calculates a UID for a given attestation. * * @param attestation The input attestation. * @param bump A bump value to use in case of a UID conflict. * * @return Attestation UID. */ function _getUID(Attestation memory attestation, uint32 bump) private pure returns (bytes32) { return keccak256( abi.encodePacked( attestation.schema, attestation.recipient, attestation.attester, attestation.time, attestation.expirationTime, attestation.revocable, attestation.refUID, attestation.data, bump ) ); } /** * @dev Refunds remaining ETH amount to the attester. * * @param remainingValue The remaining ETH amount that was not sent to the resolver. */ function _refund(uint256 remainingValue) private { if (remainingValue > 0) { // Using a regular transfer here might revert, for some non-EOA attesters, due to exceeding of the 2300 // gas limit which is why we're using call instead (via sendValue), which the 2300 gas limit does not // apply for. payable(msg.sender).sendValue(remainingValue); } } /** * @dev Merges lists of UIDs. * * @param uidLists The provided lists of UIDs. * @param uidsCount Total UIDs count. * * @return A merged and flatten list of all the UIDs. */ function _mergeUIDs(bytes32[][] memory uidLists, uint256 uidsCount) private pure returns (bytes32[] memory) { bytes32[] memory uids = new bytes32[](uidsCount); uint256 currentIndex = 0; for (uint256 i = 0; i < uidLists.length; ) { bytes32[] memory currentUids = uidLists[i]; for (uint256 j = 0; j < currentUids.length; ) { uids[currentIndex] = currentUids[j]; unchecked { ++j; ++currentIndex; } } unchecked { ++i; } } return uids; } /** * @dev Timestamps the specified bytes32 data. * * @param data The data to timestamp. * @param time The timestamp. */ function _timestamp(bytes32 data, uint64 time) private { if (_timestamps[data] != 0) { revert AlreadyTimestamped(); } _timestamps[data] = time; emit Timestamped(data, time); } /** * @dev Timestamps the specified bytes32 data. * * @param data The data to timestamp. * @param time The timestamp. */ function _revokeOffchain(address revoker, bytes32 data, uint64 time) private { mapping(bytes32 data => uint64 timestamp) storage revocations = _revocationsOffchain[revoker]; if (revocations[data] != 0) { revert AlreadyRevokedOffchain(); } revocations[data] = time; emit RevokedOffchain(revoker, data, time); } /** * @dev Returns the current's block timestamp. This method is overridden during tests and used to simulate the * current block time. */ function _time() internal view virtual returns (uint64) { return uint64(block.timestamp); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV // Deprecated in v4.8 } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. /// @solidity memory-safe-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/EIP712.sol) pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; address private immutable _CACHED_THIS; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _CACHED_THIS = address(this); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.18; import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/EIP712.sol"; import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; // prettier-ignore import { AttestationRequest, AttestationRequestData, DelegatedAttestationRequest, DelegatedRevocationRequest, RevocationRequest, RevocationRequestData } from "./IEAS.sol"; import { EIP712Signature } from "./Types.sol"; /** * @title EIP712 typed signatures verifier for EAS delegated attestations. */ abstract contract EIP712Verifier is EIP712 { error InvalidSignature(); // The hash of the data type used to relay calls to the attest function. It's the value of // keccak256("Attest(bytes32 schema,address recipient,uint64 expirationTime,bool revocable,bytes32 refUID,bytes data,uint256 nonce)"). bytes32 private constant ATTEST_TYPEHASH = 0xdbfdf8dc2b135c26253e00d5b6cbe6f20457e003fd526d97cea183883570de61; // The hash of the data type used to relay calls to the revoke function. It's the value of // keccak256("Revoke(bytes32 schema,bytes32 uid,uint256 nonce)"). bytes32 private constant REVOKE_TYPEHASH = 0xa98d02348410c9c76735e0d0bb1396f4015ac2bb9615f9c2611d19d7a8a99650; // Replay protection nonces. mapping(address => uint256) private _nonces; /** * @dev Creates a new EIP712Verifier instance. * * @param version The current major version of the signing domain */ constructor(string memory version) EIP712("EAS", version) {} /** * @dev Returns the domain separator used in the encoding of the signatures for attest, and revoke. */ function getDomainSeparator() external view returns (bytes32) { return _domainSeparatorV4(); } /** * @dev Returns the current nonce per-account. * * @param account The requested account. * * @return The current nonce. */ function getNonce(address account) external view returns (uint256) { return _nonces[account]; } /** * Returns the EIP712 type hash for the attest function. */ function getAttestTypeHash() external pure returns (bytes32) { return ATTEST_TYPEHASH; } /** * Returns the EIP712 type hash for the revoke function. */ function getRevokeTypeHash() external pure returns (bytes32) { return REVOKE_TYPEHASH; } /** * @dev Verifies delegated attestation request. * * @param request The arguments of the delegated attestation request. */ function _verifyAttest(DelegatedAttestationRequest memory request) internal { AttestationRequestData memory data = request.data; EIP712Signature memory signature = request.signature; uint256 nonce; unchecked { nonce = _nonces[request.attester]++; } bytes32 digest = _hashTypedDataV4( keccak256( abi.encode( ATTEST_TYPEHASH, request.schema, data.recipient, data.expirationTime, data.revocable, data.refUID, keccak256(data.data), nonce ) ) ); if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.attester) { revert InvalidSignature(); } } /** * @dev Verifies delegated revocation request. * * @param request The arguments of the delegated revocation request. */ function _verifyRevoke(DelegatedRevocationRequest memory request) internal { RevocationRequestData memory data = request.data; EIP712Signature memory signature = request.signature; uint256 nonce; unchecked { nonce = _nonces[request.revoker]++; } bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(REVOKE_TYPEHASH, request.schema, data.uid, nonce))); if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.revoker) { revert InvalidSignature(); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import { ISchemaRegistry } from "./ISchemaRegistry.sol"; import { Attestation, EIP712Signature } from "./Types.sol"; /** * @dev A struct representing the arguments of the attestation request. */ struct AttestationRequestData { address recipient; // The recipient of the attestation. uint64 expirationTime; // The time when the attestation expires (Unix timestamp). bool revocable; // Whether the attestation is revocable. bytes32 refUID; // The UID of the related attestation. bytes data; // Custom attestation data. uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors. } /** * @dev A struct representing the full arguments of the attestation request. */ struct AttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData data; // The arguments of the attestation request. } /** * @dev A struct representing the full arguments of the full delegated attestation request. */ struct DelegatedAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData data; // The arguments of the attestation request. EIP712Signature signature; // The EIP712 signature data. address attester; // The attesting account. } /** * @dev A struct representing the full arguments of the multi attestation request. */ struct MultiAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData[] data; // The arguments of the attestation request. } /** * @dev A struct representing the full arguments of the delegated multi attestation request. */ struct MultiDelegatedAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData[] data; // The arguments of the attestation requests. EIP712Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address attester; // The attesting account. } /** * @dev A struct representing the arguments of the revocation request. */ struct RevocationRequestData { bytes32 uid; // The UID of the attestation to revoke. uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors. } /** * @dev A struct representing the full arguments of the revocation request. */ struct RevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData data; // The arguments of the revocation request. } /** * @dev A struct representing the arguments of the full delegated revocation request. */ struct DelegatedRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData data; // The arguments of the revocation request. EIP712Signature signature; // The EIP712 signature data. address revoker; // The revoking account. } /** * @dev A struct representing the full arguments of the multi revocation request. */ struct MultiRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData[] data; // The arguments of the revocation request. } /** * @dev A struct representing the full arguments of the delegated multi revocation request. */ struct MultiDelegatedRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData[] data; // The arguments of the revocation requests. EIP712Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address revoker; // The revoking account. } /** * @title EAS - Ethereum Attestation Service interface. */ interface IEAS { /** * @dev Emitted when an attestation has been made. * * @param recipient The recipient of the attestation. * @param attester The attesting account. * @param uid The UID the revoked attestation. * @param schema The UID of the schema. */ event Attested(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schema); /** * @dev Emitted when an attestation has been revoked. * * @param recipient The recipient of the attestation. * @param attester The attesting account. * @param schema The UID of the schema. * @param uid The UID the revoked attestation. */ event Revoked(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schema); /** * @dev Emitted when a data has been timestamped. * * @param data The data. * @param timestamp The timestamp. */ event Timestamped(bytes32 indexed data, uint64 indexed timestamp); /** * @dev Emitted when a data has been revoked. * * @param revoker The address of the revoker. * @param data The data. * @param timestamp The timestamp. */ event RevokedOffchain(address indexed revoker, bytes32 indexed data, uint64 indexed timestamp); /** * @dev Returns the address of the global schema registry. * * @return The address of the global schema registry. */ function getSchemaRegistry() external view returns (ISchemaRegistry); /** * @dev Attests to a specific schema. * * @param request The arguments of the attestation request. * * Example: * * attest({ * schema: "0facc36681cbe2456019c1b0d1e7bedd6d1d40f6f324bf3dd3a4cef2999200a0", * data: { * recipient: "0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf", * expirationTime: 0, * revocable: true, * refUID: "0x0000000000000000000000000000000000000000000000000000000000000000", * data: "0xF00D", * value: 0 * } * }) * * @return The UID of the new attestation. */ function attest(AttestationRequest calldata request) external payable returns (bytes32); /** * @dev Attests to a specific schema via the provided EIP712 signature. * * @param delegatedRequest The arguments of the delegated attestation request. * * Example: * * attestByDelegation({ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: { * recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', * expirationTime: 1673891048, * revocable: true, * refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', * data: '0x1234', * value: 0 * }, * signature: { * v: 28, * r: '0x148c...b25b', * s: '0x5a72...be22' * }, * attester: '0xc5E8740aD971409492b1A63Db8d83025e0Fc427e' * }) * * @return The UID of the new attestation. */ function attestByDelegation( DelegatedAttestationRequest calldata delegatedRequest ) external payable returns (bytes32); /** * @dev Attests to multiple schemas. * * @param multiRequests The arguments of the multi attestation requests. The requests should be grouped by distinct * schema ids to benefit from the best batching optimization. * * Example: * * multiAttest([{ * schema: '0x33e9094830a5cba5554d1954310e4fbed2ef5f859ec1404619adea4207f391fd', * data: [{ * recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', * expirationTime: 1673891048, * revocable: true, * refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', * data: '0x1234', * value: 1000 * }, * { * recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', * expirationTime: 0, * revocable: false, * refUID: '0x480df4a039efc31b11bfdf491b383ca138b6bde160988222a2a3509c02cee174', * data: '0x00', * value: 0 * }], * }, * { * schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425', * data: [{ * recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', * expirationTime: 0, * revocable: true, * refUID: '0x75bf2ed8dca25a8190c50c52db136664de25b2449535839008ccfdab469b214f', * data: '0x12345678', * value: 0 * }, * }]) * * @return The UIDs of the new attestations. */ function multiAttest(MultiAttestationRequest[] calldata multiRequests) external payable returns (bytes32[] memory); /** * @dev Attests to multiple schemas using via provided EIP712 signatures. * * @param multiDelegatedRequests The arguments of the delegated multi attestation requests. The requests should be * grouped by distinct schema ids to benefit from the best batching optimization. * * Example: * * multiAttestByDelegation([{ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: [{ * recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', * expirationTime: 1673891048, * revocable: true, * refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', * data: '0x1234', * value: 0 * }, * { * recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', * expirationTime: 0, * revocable: false, * refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', * data: '0x00', * value: 0 * }], * signatures: [{ * v: 28, * r: '0x148c...b25b', * s: '0x5a72...be22' * }, * { * v: 28, * r: '0x487s...67bb', * s: '0x12ad...2366' * }], * attester: '0x1D86495b2A7B524D747d2839b3C645Bed32e8CF4' * }]) * * @return The UIDs of the new attestations. */ function multiAttestByDelegation( MultiDelegatedAttestationRequest[] calldata multiDelegatedRequests ) external payable returns (bytes32[] memory); /** * @dev Revokes an existing attestation to a specific schema. * * Example: * * revoke({ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: { * uid: '0x101032e487642ee04ee17049f99a70590c735b8614079fc9275f9dd57c00966d', * value: 0 * } * }) * * @param request The arguments of the revocation request. */ function revoke(RevocationRequest calldata request) external payable; /** * @dev Revokes an existing attestation to a specific schema via the provided EIP712 signature. * * Example: * * revokeByDelegation({ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: { * uid: '0xcbbc12102578c642a0f7b34fe7111e41afa25683b6cd7b5a14caf90fa14d24ba', * value: 0 * }, * signature: { * v: 27, * r: '0xb593...7142', * s: '0x0f5b...2cce' * }, * revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992' * }) * * @param delegatedRequest The arguments of the delegated revocation request. */ function revokeByDelegation(DelegatedRevocationRequest calldata delegatedRequest) external payable; /** * @dev Revokes existing attestations to multiple schemas. * * @param multiRequests The arguments of the multi revocation requests. The requests should be grouped by distinct * schema ids to benefit from the best batching optimization. * * Example: * * multiRevoke([{ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: [{ * uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25', * value: 1000 * }, * { * uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade', * value: 0 * }], * }, * { * schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425', * data: [{ * uid: '0x053d42abce1fd7c8fcddfae21845ad34dae287b2c326220b03ba241bc5a8f019', * value: 0 * }, * }]) */ function multiRevoke(MultiRevocationRequest[] calldata multiRequests) external payable; /** * @dev Revokes existing attestations to multiple schemas via provided EIP712 signatures. * * @param multiDelegatedRequests The arguments of the delegated multi revocation attestation requests. The requests should be * grouped by distinct schema ids to benefit from the best batching optimization. * * Example: * * multiRevokeByDelegation([{ * schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', * data: [{ * uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25', * value: 1000 * }, * { * uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade', * value: 0 * }], * signatures: [{ * v: 28, * r: '0x148c...b25b', * s: '0x5a72...be22' * }, * { * v: 28, * r: '0x487s...67bb', * s: '0x12ad...2366' * }], * revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992' * }]) * */ function multiRevokeByDelegation( MultiDelegatedRevocationRequest[] calldata multiDelegatedRequests ) external payable; /** * @dev Timestamps the specified bytes32 data. * * @param data The data to timestamp. * * @return The timestamp the data was timestamped with. */ function timestamp(bytes32 data) external returns (uint64); /** * @dev Timestamps the specified multiple bytes32 data. * * @param data The data to timestamp. * * @return The timestamp the data was timestamped with. */ function multiTimestamp(bytes32[] calldata data) external returns (uint64); /** * @dev Revokes the specified bytes32 data. * * @param data The data to timestamp. * * @return The timestamp the data was revoked with. */ function revokeOffchain(bytes32 data) external returns (uint64); /** * @dev Revokes the specified multiple bytes32 data. * * @param data The data to timestamp. * * @return The timestamp the data was revoked with. */ function multiRevokeOffchain(bytes32[] calldata data) external returns (uint64); /** * @dev Returns an existing attestation by UID. * * @param uid The UID of the attestation to retrieve. * * @return The attestation data members. */ function getAttestation(bytes32 uid) external view returns (Attestation memory); /** * @dev Checks whether an attestation exists. * * @param uid The UID of the attestation to retrieve. * * @return Whether an attestation exists. */ function isAttestationValid(bytes32 uid) external view returns (bool); /** * @dev Returns the timestamp that the specified data was timestamped with. * * @param data The data to query. * * @return The timestamp the data was timestamped with. */ function getTimestamp(bytes32 data) external view returns (uint64); /** * @dev Returns the timestamp that the specified data was timestamped with. * * @param data The data to query. * * @return The timestamp the data was timestamped with. */ function getRevokeOffchain(address revoker, bytes32 data) external view returns (uint64); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import { ISchemaResolver } from "./resolver/ISchemaResolver.sol"; /** * @title A struct representing a record for a submitted schema. */ struct SchemaRecord { bytes32 uid; // The unique identifier of the schema. ISchemaResolver resolver; // Optional schema resolver. bool revocable; // Whether the schema allows revocations explicitly. string schema; // Custom specification of the schema (e.g., an ABI). } /** * @title The global schema registry interface. */ interface ISchemaRegistry { /** * @dev Emitted when a new schema has been registered * * @param uid The schema UID. * @param registerer The address of the account used to register the schema. */ event Registered(bytes32 indexed uid, address registerer); /** * @dev Submits and reserves a new schema * * @param schema The schema data schema. * @param resolver An optional schema resolver. * @param revocable Whether the schema allows revocations explicitly. * * @return The UID of the new schema. */ function register(string calldata schema, ISchemaResolver resolver, bool revocable) external returns (bytes32); /** * @dev Returns an existing schema by UID * * @param uid The UID of the schema to retrieve. * * @return The schema data members. */ function getSchema(bytes32 uid) external view returns (SchemaRecord memory); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.18; // A representation of an empty/uninitialized UID. bytes32 constant EMPTY_UID = 0; /** * @dev A struct representing EIP712 signature data. */ struct EIP712Signature { uint8 v; // The recovery ID. bytes32 r; // The x-coordinate of the nonce R. bytes32 s; // The signature data. } /** * @dev A struct representing a single attestation. */ struct Attestation { bytes32 uid; // A unique identifier of the attestation. bytes32 schema; // The unique identifier of the schema. uint64 time; // The time when the attestation was created (Unix timestamp). uint64 expirationTime; // The time when the attestation expires (Unix timestamp). uint64 revocationTime; // The time when the attestation was revoked (Unix timestamp). bytes32 refUID; // The UID of the related attestation. address recipient; // The recipient of the attestation. address attester; // The attester/sender of the attestation. bool revocable; // Whether the attestation is revocable. bytes data; // Custom attestation data. }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import { Attestation } from "../Types.sol"; /** * @title The interface of an optional schema resolver. */ interface ISchemaResolver { /** * @dev Returns whether the resolver supports ETH transfers. */ function isPayable() external pure returns (bool); /** * @dev Processes an attestation and verifies whether it's valid. * * @param attestation The new attestation. * * @return Whether the attestation is valid. */ function attest(Attestation calldata attestation) external payable returns (bool); /** * @dev Processes multiple attestations and verifies whether they are valid. * * @param attestations The new attestations. * @param values Explicit ETH amounts which were sent with each attestation. * * @return Whether all the attestations are valid. */ function multiAttest( Attestation[] calldata attestations, uint256[] calldata values ) external payable returns (bool); /** * @dev Processes an attestation revocation and verifies if it can be revoked. * * @param attestation The existing attestation to be revoked. * * @return Whether the attestation can be revoked. */ function revoke(Attestation calldata attestation) external payable returns (bool); /** * @dev Processes revocation of multiple attestation and verifies they can be revoked. * * @param attestations The existing attestations to be revoked. * @param values Explicit ETH amounts which were sent with each revocation. * * @return Whether the attestations can be revoked. */ function multiRevoke( Attestation[] calldata attestations, uint256[] calldata values ) external payable returns (bool); }
{ "evmVersion": "paris", "libraries": {}, "metadata": { "bytecodeHash": "none", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 1000000 }, "remappings": [], "viaIR": true, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
[{"inputs":[{"internalType":"contract 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AttestationRequestData","name":"data","type":"tuple"}],"internalType":"struct AttestationRequest","name":"request","type":"tuple"}],"name":"attest","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct AttestationRequestData","name":"data","type":"tuple"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct 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DelegatedAttestationRequest","name":"delegatedRequest","type":"tuple"}],"name":"attestByDelegation","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getAttestTypeHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32","name":"uid","type":"bytes32"}],"name":"getAttestation","outputs":[{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"bytes32","name":"schema","type":"bytes32"},{"internalType":"uint64","name":"time","type":"uint64"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"uint64","name":"revocationTime","type":"uint64"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"address","name":"attester","type":"address"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct Attestation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDomainSeparator","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"revoker","type":"address"},{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"getRevokeOffchain","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRevokeTypeHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getSchemaRegistry","outputs":[{"internalType":"contract ISchemaRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"getTimestamp","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"uid","type":"bytes32"}],"name":"isAttestationValid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct AttestationRequestData[]","name":"data","type":"tuple[]"}],"internalType":"struct MultiAttestationRequest[]","name":"multiRequests","type":"tuple[]"}],"name":"multiAttest","outputs":[{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct 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MultiRevocationRequest[]","name":"multiRequests","type":"tuple[]"}],"name":"multiRevoke","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData[]","name":"data","type":"tuple[]"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct EIP712Signature[]","name":"signatures","type":"tuple[]"},{"internalType":"address","name":"revoker","type":"address"}],"internalType":"struct MultiDelegatedRevocationRequest[]","name":"multiDelegatedRequests","type":"tuple[]"}],"name":"multiRevokeByDelegation","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"data","type":"bytes32[]"}],"name":"multiRevokeOffchain","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"data","type":"bytes32[]"}],"name":"multiTimestamp","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData","name":"data","type":"tuple"}],"internalType":"struct RevocationRequest","name":"request","type":"tuple"}],"name":"revoke","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData","name":"data","type":"tuple"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct EIP712Signature","name":"signature","type":"tuple"},{"internalType":"address","name":"revoker","type":"address"}],"internalType":"struct DelegatedRevocationRequest","name":"delegatedRequest","type":"tuple"}],"name":"revokeByDelegation","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"revokeOffchain","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"timestamp","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000a7e2ff54e76b8e6659aedc9103fb21c038050d0
-----Decoded View---------------
Arg [0] : registry (address): 0x0a7E2Ff54e76B8E6659aedc9103FB21c038050D0
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000a7e2ff54e76b8e6659aedc9103fb21c038050d0
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.