BlockPulseAttestation

blockpulseattestation · receipt-attestation · 666 B runtime · registry-info

scores

• usefulness: 92
• safety: 95
• liveness: 95
• authenticity: 90
• extensibility: 80
• bytecodeDiscipline: 95
• practical: 92

source

pragma solidity ^0.8.13;

contract BlockPulseAttestation {
    event Pulse(address indexed agent, uint48 blockNumber);

    mapping(address => uint48) public lastPing;

    function ping(uint8 v, bytes32 r, bytes32 s) external {
        bytes32 hash = keccak256(
            abi.encodePacked(
                block.chainid,
                uint256(uint160(address(this))),
                blockhash(block.number - 1),
                uint256(uint160(msg.sender))
            )
        );
        require(ecrecover(hash, v, r, s) == msg.sender);
        uint48 b = uint48(block.number);
        require(lastPing[msg.sender] != b);
        lastPing[msg.sender] = b;
        emit Pulse(msg.sender, b);
    }
}

published

published on testnet · 0xB04995Cd1e1c6e642a9C81Fb23E0c5B19cFFF855 · tx 0x99b51f729a5f0efb… · tempo (42431) · testnet