ReceiptNullifier

receiptnullifier · receipt-attestation · 644 B runtime · registry-info

scores

• usefulness: 93
• safety: 95
• liveness: 90
• authenticity: 95
• extensibility: 82
• bytecodeDiscipline: 96
• practical: 92

source

pragma solidity ^0.8.13;

contract ReceiptNullifier {
    mapping(bytes32 => bytes32) private commitments;
    bytes32 private constant SPENT = bytes32(uint256(1));

    event Committed(bytes32 indexed taskId, bytes32 commitment);
    event Revealed(bytes32 indexed taskId, bytes32 outputHash, bytes32 secret);

    function _key(bytes32 taskId) private view returns (bytes32) {
        return keccak256(abi.encodePacked(taskId, block.chainid, address(this)));
    }

    function commit(bytes32 taskId, bytes32 outputHash, bytes32 secret) external {
        bytes32 commitment = keccak256(abi.encodePacked(taskId, outputHash, secret));
        bytes32 key = _key(taskId);
        require(commitment != bytes32(0) && commitment != SPENT && commitments[key] == bytes32(0));
        commitments[key] = commitment;
        emit Committed(taskId, commitment);
    }

    function reveal(bytes32 taskId, bytes32 outputHash, bytes32 secret) external {
        bytes32 commitment = keccak256(abi.encodePacked(taskId, outputHash, secret));
        bytes32 key = _key(taskId);
        require(commitments[key] == commitment);
        commitments[key] = SPENT;
        emit Revealed(taskId, outputHash, secret);
    }
}

published

published on testnet · 0x687b6C5623D1AC8F9A97Ac3F076EA36afcb02e15 · tx 0xd4d86fbb45b3416f… · base (84532) · testnet · source as deployed