世界矿场：基于多链架构的创新型DeFi挖矿平台开发方案

// 矿场购买合约示例
function purchaseMine(uint256 mineType) external payable {
    require(mineType < 6, "Invalid mine type");
    require(msg.value >= minePrices[mineType], "Insufficient payment");
    
    userMines[msg.sender][mineType]++;
    totalMines[mineType]++;
    
    emit MinePurchased(msg.sender, mineType, block.timestamp);
}

const mineConfig = {
  0: {name: "黑铁", dailyReward: 10, price: 100},
  1: {name: "青铜", dailyReward: 25, price: 250},
  // ...其他等级配置
  5: {name: "晶钻", dailyReward: 200, price: 2000}
}

function calculateReward(address user) public view returns(uint256) {
    uint256 total;
    for(uint i=0; i<6; i++){
        total += userMines[user][i] * mineConfig[i].dailyReward;
    }
    return total;
}

uint256 public rewardFactor = 1000; // 初始奖励系数

function updateRewardFactor() internal {
    uint256 circulatingSupply = token.totalSupply();
    if(circulatingSupply > 1000000 ether){
        rewardFactor = 800;
    } else if(circulatingSupply > 500000 ether){
        rewardFactor = 900;
    }
    // 其他条件判断...
}

function adjustMiningDifficulty() public {
    uint256 totalHashrate = getTotalHashrate();
    if(totalHashrate > targetHashrate){
        miningDifficulty += 5;
    } else {
        miningDifficulty = miningDifficulty > 5 ? miningDifficulty -5 : 1;
    }
}

function upgradeToNFT(uint256 mineId) external {
    require(ownerOf(mineId) == msg.sender, "Not owner");
    uint256 newLevel = mineLevel[mineId] + 1;
    mineLevel[mineId] = newLevel;
    emit MineUpgraded(mineId, newLevel);
}