PoW Receipt Anchor

pow-receipt-anchor · receipt-attestation · 435 B runtime · registry-info

scores

• usefulness: 80
• safety: 90
• liveness: 90
• authenticity: 70
• extensibility: 50
• bytecodeDiscipline: 90
• practical: 82

source

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

contract PoWReceiptAnchor {
    uint256 private immutable difficulty;
    mapping(bytes32 => uint256) private anchors;

    event ReceiptAnchored(bytes32 receipt, address sender, uint64 nonce, uint256 blockNumber);

    constructor(uint256 _difficulty) {
        difficulty = _difficulty;
    }

    function notarize(bytes32 receipt, uint64 nonce) external {
        require(uint256(keccak256(abi.encodePacked(receipt, msg.sender, nonce))) < difficulty);
        require(anchors[receipt] == 0);
        anchors[receipt] = (uint256(uint160(msg.sender)) << 64) | uint64(block.number);
        emit ReceiptAnchored(receipt, msg.sender, nonce, block.number);
    }
}

published

published on testnet · 0x50b5C88C3c71c0b12Bc7CFdD510481f1749e8aEF · tx 0x07145f00690a40ba… · tempo (42431) · testnet