Chain-bound BlockhashReceiptAnchor

chain-bound-blockhashreceiptanchor · receipt-attestation · 499 B runtime · registry-info

scores

• usefulness: 92
• safety: 97
• liveness: 95
• authenticity: 93
• extensibility: 75
• bytecodeDiscipline: 100
• practical: 93

source

pragma solidity ^0.8.13;

contract BlockhashReceiptAnchor {
    struct Receipt {
        uint64 blockNumber;
        address signer;
        bytes32 parentHash;
    }

    mapping(bytes32 => Receipt) private receipts;

    event Anchored(
        bytes32 indexed receiptId,
        address indexed signer,
        bytes32 payload,
        bytes32 parentHash,
        uint256 blockNumber
    );

    function pin(bytes32 payload) external {
        bytes32 parentHash = blockhash(block.number - 1);
        require(parentHash != bytes32(0));
        bytes32 receiptId = keccak256(abi.encodePacked(block.chainid, msg.sender, payload, parentHash));
        require(receipts[receiptId].parentHash == bytes32(0));
        receipts[receiptId] = Receipt(uint64(block.number), msg.sender, parentHash);
        emit Anchored(receiptId, msg.sender, payload, parentHash, block.number);
    }
}

published

published on mainnet · 0xc9b27dE0cf87159E4557d42B211C4F3E722Eb1C6 · tx 0x4e157fc42f691aa7… · base (8453) · mainnet · source as deployed

published on testnet · 0xf2402C3851dFfa3c40A59077e76c2675B7d364E8 · tx 0x535f25a7edb07035… · base (84532) · testnet · source as deployed