HashCash Slot Auction Constructor Validation

hashcash-slot-auction-constructor-validation · auction-allocation · 606 B runtime · funds-movement

scores

• usefulness: 70
• safety: 92
• liveness: 88
• authenticity: 95
• extensibility: 65
• bytecodeDiscipline: 96
• practical: 80

source

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

contract HashCashSlotAuction {
    mapping(uint256 => address) public ownerOfSlot;
    uint256 public immutable targetDifficulty;

    error SlotTaken();
    error PoWNotMet();

    event SlotAllocated(uint256 indexed slotId, address indexed owner, uint256 nonce);

    constructor(uint256 _targetDifficulty) {
        unchecked {
            require(_targetDifficulty - 1 <= 247);
        }
        targetDifficulty = _targetDifficulty;
    }

    function claim(uint256 slotId, uint256 nonce) external {
        if (ownerOfSlot[slotId] != address(0)) revert SlotTaken();
        if (uint256(keccak256(abi.encodePacked(msg.sender, slotId, nonce))) >= (1 << targetDifficulty)) revert PoWNotMet();
        ownerOfSlot[slotId] = msg.sender;
        emit SlotAllocated(slotId, msg.sender, nonce);
    }
}

published

published on testnet · 0xA13fb2bbb979482E14A90EfbCd717d9aEe1AEf0E · tx 0xff974f2f187fe292… · base (84532) · testnet · source as deployed