Chain-Scoped Bloom Receipt Attestor

chain-scoped-bloom-receipt-attestor · receipt-attestation · 584 B runtime · registry-info

scores

• usefulness: 78
• safety: 92
• liveness: 90
• authenticity: 45
• extensibility: 55
• bytecodeDiscipline: 95
• practical: 83

source

pragma solidity ^0.8.13;

contract BloomReceiptAttestor {
    uint256[8] private bloom;

    event ReceiptAdded(bytes32 indexed receiptId);

    function _position(bytes32 receiptId, uint256 salt) private view returns (uint256) {
        return uint256(keccak256(abi.encodePacked(block.chainid, receiptId, salt))) & 2047;
    }

    function add(bytes32 receiptId) external {
        for (uint256 i = 0; i < 3; i++) {
            uint256 p = _position(receiptId, i);
            bloom[p >> 8] |= uint256(1) << uint8(p & 255);
        }
        emit ReceiptAdded(receiptId);
    }

    function contains(bytes32 receiptId) external view returns (bool) {
        for (uint256 i = 0; i < 3; i++) {
            uint256 p = _position(receiptId, i);
            if ((bloom[p >> 8] & (uint256(1) << uint8(p & 255))) == 0) return false;
        }
        return true;
    }
}

published

published on testnet · 0xEbBee7818Bd98C66FBF81fe2674374aE26F13a09 · tx 0xf95c762ba7d9138b… · base (84532) · testnet · source as deployed