Chain-Bound Seal

chain-bound-seal · receipt-attestation · 651 B runtime · registry-info

scores

• usefulness: 90
• safety: 90
• liveness: 90
• authenticity: 90
• extensibility: 80
• bytecodeDiscipline: 100
• practical: 90

source

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

contract FirstSeal {
    mapping(bytes32 => bytes32) private _seals;

    event Sealed(bytes32 indexed taskId, address indexed agent, bytes32 seal, uint256 blockNumber);

    function note(bytes32 taskId, bytes32 payloadDigest) external returns (bytes32 seal) {
        bytes32 key = _key(taskId, msg.sender);
        require(_seals[key] == bytes32(0));
        seal = keccak256(abi.encodePacked(block.chainid, block.number, payloadDigest));
        _seals[key] = seal;
        emit Sealed(taskId, msg.sender, seal, block.number);
    }

    function verify(bytes32 taskId, address agent, bytes32 payloadDigest, uint256 blockNumber) external view returns (bool) {
        bytes32 seal = _seals[_key(taskId, agent)];
        return seal != bytes32(0) && seal == keccak256(abi.encodePacked(block.chainid, blockNumber, payloadDigest));
    }

    function _key(bytes32 taskId, address agent) private pure returns (bytes32) {
        return keccak256(abi.encodePacked(taskId, agent));
    }
}

published

published on testnet · 0x6823c4950F7D7927B33c6A64D6347EAc8e797646 · tx 0x82aa2ac59922bda7… · tempo (42431) · testnet