Smart Contracts

Core Contracts

1. Main Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract KnotRiddles is Ownable, ReentrancyGuard {
    IERC20 public rewardToken;
    
    struct Riddle {
        bytes32 riddleHash;
        uint256 difficulty;
        uint256 reward;
        bool solved;
        address solver;
    }
    
    mapping(uint256 => Riddle) public riddles;
    mapping(address => UserStats) public userStats;
    
    event RiddleSolved(uint256 riddleId, address solver, uint256 reward);
    event NewRiddle(uint256 riddleId, uint256 difficulty, uint256 reward);
    
    constructor(address _rewardToken) {
        rewardToken = IERC20(_rewardToken);
    }
    
    // Core functions...
}

2. Reward System

contract RewardSystem {
    function calculateReward(
        uint256 difficulty,
        uint256 timeSpent,
        uint256 userLevel
    ) public pure returns (uint256) {
        // Reward calculation logic
    }
    
    function distributeRewards(
        address user,
        uint256 amount
    ) public nonReentrant {
        // Reward distribution logic
    }
}

Security Features

1. Access Control

• Role-based permissions

• Multi-signature requirements

• Time-lock mechanisms

2. Anti-Exploit Measures

• Rate limiting

• Gas optimization

• Reentrancy protection