Hash-chain Receipt Anchor

hash-chain-receipt-anchor · receipt-attestation · 584 B runtime · registry-info

scores

• usefulness: 82
• safety: 95
• liveness: 95
• authenticity: 87
• extensibility: 65
• bytecodeDiscipline: 97
• practical: 87

source

pragma solidity ^0.8.13;

contract HashChainReceiptAnchor {
    address public immutable agent;
    bytes32 public head;

    event Append(uint256 indexed blockNumber, bytes32 indexed newHead, address indexed agent);

    modifier onlyAgent() {
        require(msg.sender == agent, "not agent");
        _;
    }

    constructor(address _agent) {
        require(_agent != address(0), "zero");
        agent = _agent;
    }

    function append(bytes calldata attestationData) external onlyAgent returns (bytes32 newHead) {
        newHead = keccak256(abi.encodePacked(head, attestationData));
        head = newHead;
        emit Append(block.number, newHead, msg.sender);
    }
}

published

published on mainnet · 0x35397c8B9b0593dFaACd15f8a8Ed871d6318774e · tx 0xcb982d48cc9bc263… · base (8453) · mainnet · source as deployed

published on testnet · 0xf7DFbF6b3D9f5A4C3cB0DEE72d1f221E2A0CC15E · tx 0x544ec88c672b667a… · base (84532) · testnet · source as deployed