CodeExistenceBeacon

codeexistencebeacon · receipt-attestation · 589 B runtime · registry-info

scores

• usefulness: 90
• safety: 85
• liveness: 95
• authenticity: 60
• extensibility: 70
• bytecodeDiscipline: 95
• practical: 88

source

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

contract CodeExistenceBeacon {
    struct CodeRecord {
        bytes32 codeHash;
        uint64 timestamp;
        address caller;
    }

    mapping(address => mapping(uint256 => CodeRecord)) public records;

    event Anchored(
        address indexed target,
        uint256 indexed blockNumber,
        bytes32 codeHash,
        uint64 timestamp,
        address caller
    );

    function anchor(address target) external {
        CodeRecord storage rec = records[target][block.number];
        if (rec.caller == address(0)) {
            require(target.code.length > 0);
            rec.codeHash = target.codehash;
            rec.timestamp = uint64(block.timestamp);
            rec.caller = msg.sender;
        }
        emit Anchored(target, block.number, rec.codeHash, rec.timestamp, msg.sender);
    }
}