DeFi流动性挖矿技术开发|DeFi质押挖矿系统搭建方案

DeFi产品都需要具备哪些基础技术能力呢？

首先是资产发行技术能力（如：ERC-20方式）资产跨链导入技术能力（比如：公证人机制、侧链/中继机制、哈希锁定、支持WalletConnect协议等。并且积极导入MPC应用场景），目前以太坊因为具备ERC-20资产发行技术能力，在DeFi占比达到95%左右，一骑绝尘。

其次是基于智能合约的借贷、资管、券商、交易所、保险服务生态，DeFi协议的本质就是债权合约，权益合约和其他衍生品合约的组合，设计协议的合理性和经济学效应。

再者是用户最熟悉的生态入口，也就是我们常用的APP或者网站等。入口的建设极其重要，因为用户感知不到技术的“好坏”，只有从可视化产品中得到判断。

最后是ORACLE预言机建设，外部ORACLE预言机接入。预言机是区块链智能合约与外部世界交互的接口，可以查找和验证真实世界的数据，并以加密的方式将信息提交给智能合约使用，所以预言机对于DeFi来说至关重要。

随着技术实力的额提升，我们可以将DeFi的演化分为三个阶段：

第一阶段，提供基础模块服务。包括：发行类，包括资产创建，资产跨链导入，流动性挖矿等（如：LAT、ETH、BTC、USDT导入资产管理）；借贷质押支付类（基础商业银行服务）；支持基础DeFi协议标准、以及生态类。

第二阶段，提供金融服务。如：资管类（各类工具群，包括钱包等）；交易类（流动性促进，信用交易等券商服务等）；固收类及衍生品交易类。

第三阶段，为生态完善。包括：DeFi保险作为风险对冲入场、可靠可信的资讯数据聚合服务广泛应用（ORACLE的基础）、基于分布式数字身份的信用管理类服务等。

合约源代码

constructor(address ownerAddress) public {
    levelPrice[1] = 0.025 ether;
    for (uint8 i = 2; i <= LAST_LEVEL; i++) {
        levelPrice[i] = levelPrice[i-1] * 2;
    }
    
    owner = ownerAddress;
    
    User memory user = User({
        id: 1,
        referrer: address(0),
        partnersCount: uint(0)
    });
    
    users[ownerAddress] = user;
    idToAddress[1] = ownerAddress;
    
    for (uint8 i = 1; i <= LAST_LEVEL; i++) {
        users[ownerAddress].activeX3Levels[i] = true;
        users[ownerAddress].activeX6Levels[i] = true;
    }
    
    userIds[1] = ownerAddress;
}

function() external payable {
    if(msg.data.length == 0) {
        return registration(msg.sender, owner);
    }
    
    registration(msg.sender, bytesToAddress(msg.data));
}

function registrationExt(address referrerAddress) external payable {
    registration(msg.sender, referrerAddress);
}

function buyNewLevel(uint8 matrix, uint8 level) external payable {
    require(isUserExists(msg.sender), "user is not exists. Register first.");
    require(matrix == 1 || matrix == 2, "invalid matrix");
    require(msg.value == levelPrice[level], "invalid price");
    require(level > 1 && level <= LAST_LEVEL, "invalid level");

    if (matrix == 1) {
        require(!users[msg.sender].activeX3Levels[level], "level already activated");

        if (users[msg.sender].x3Matrix[level-1].blocked) {
            users[msg.sender].x3Matrix[level-1].blocked = false;
        }

        address freeX3Referrer = findFreeX3Referrer(msg.sender, level);
        users[msg.sender].x3Matrix[level].currentReferrer = freeX3Referrer;
        users[msg.sender].activeX3Levels[level] = true;
        updateX3Referrer(msg.sender, freeX3Referrer, level);
        
        emit Upgrade(msg.sender, freeX3Referrer, 1, level);

    } else {
        require(!users[msg.sender].activeX6Levels[level], "level already activated"); 

        if (users[msg.sender].x6Matrix[level-1].blocked) {
            users[msg.sender].x6Matrix[level-1].blocked = false;
        }

        address freeX6Referrer = findFreeX6Referrer(msg.sender, level);
        
        users[msg.sender].activeX6Levels[level] = true;
        updateX6Referrer(msg.sender, freeX6Referrer, level);
        
        emit Upgrade(msg.sender, freeX6Referrer, 2, level);
    }
}    

function registration(address userAddress, address referrerAddress) private {
    require(msg.value == 0.05 ether, "registration cost 0.05");
    require(!isUserExists(userAddress), "user exists");
    require(isUserExists(referrerAddress), "referrer not exists");
    
    uint32 size;
    assembly {
        size := extcodesize(userAddress)
    }
    require(size == 0, "cannot be a contract");
    
    User memory user = User({
        id: lastUserId,
        referrer: referrerAddress,
        partnersCount: 0
    });
    
    users[userAddress] = user;
    idToAddress[lastUserId] = userAddress;
    
    users[userAddress].referrer = referrerAddress;
    
    users[userAddress].activeX3Levels[1] = true; 
    users[userAddress].activeX6Levels[1] = true;
    
    
    userIds[lastUserId] = userAddress;
    lastUserId++;
    
    users[referrerAddress].partnersCount++;

    address freeX3Referrer = findFreeX3Referrer(userAddress, 1);
    users[userAddress].x3Matrix[1].currentReferrer = freeX3Referrer;
    updateX3Referrer(userAddress, freeX3Referrer, 1);

    updateX6Referrer(userAddress, findFreeX6Referrer(userAddress, 1), 1);
    
    emit Registration(userAddress, referrerAddress, users[userAddress].id, users[referrerAddress].id);
}

function updateX3Referrer(address userAddress, address referrerAddress, uint8 level) private {
    users[referrerAddress].x3Matrix[level].referrals.push(userAddress);

    if (users[referrerAddress].x3Matrix[level].referrals.length < 3) {
        emit NewUserPlace(userAddress, referrerAddress, 1, level, uint8(users[referrerAddress].x3Matrix[level].referrals.length));
        return sendETHDividends(referrerAddress, userAddress, 1, level);
    }
    
    emit NewUserPlace(userAddress, referrerAddress, 1, level, 3);
    //close matrix
    users[referrerAddress].x3Matrix[level].referrals = new address[](0);
    if (!users[referrerAddress].activeX3Levels[level+1] && level != LAST_LEVEL) {
        users[referrerAddress].x3Matrix[level].blocked = true;
    }