DAPP代幣預售/LP質押挖礦系統技術開發詳情

DAPP代幣質押挖是一種基於區塊鏈技術的數字資產，它可以用於在去中心化應用程式（DAPP）中實現一定程度的治理和

參與獎勵。本文將介紹如何使用Solidity語言編寫一個DAPP代幣質押挖礦合約，並提供相關程式碼示例。

合約介紹

該合約支援以下功能：

（1）DAPP代幣質押：使用者可以將其擁有的DAPP代幣質押到合約中，獲得一定數量的獎勵代幣作為回報。

（2）獎勵代幣挖礦：使用者可以使用質押獲得的獎勵代幣來挖礦，獲得新的獎勵代幣作為回報。

合約程式碼示例

下面是一個基於Solidity的DAPP代幣質押挖礦合約的程式碼示例：

typescript

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pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "@openzeppelin/contracts/access/Ownable.sol";

contract DAPPStakingContract is Ownable {

    

    IERC20 public dappToken;

    IERC20 public rewardToken;

    uint256 public rewardRate;

    uint256 public lastUpdateTime;

    uint256 public rewardPerTokenStored;

    

    mapping(address => uint256) public userRewardPerTokenPaid;

    mapping(address => uint256) public rewards;

    mapping(address => uint256) public stakedBalance;

    

    constructor(address _dappAddress, address _rewardAddress, uint256 _rewardRate) {

        dappToken = IERC20(_dappAddress);

        rewardToken = IERC20(_rewardAddress);

        rewardRate = _rewardRate;

        lastUpdateTime = block.timestamp;

    }

    

    modifier updateReward(address account) {

        rewardPerTokenStored = rewardPerToken();

        lastUpdateTime = block.timestamp;

        if (account != address(0)) {

            rewards[account] = earned(account);

            userRewardPerTokenPaid[account] = rewardPerTokenStored;

        }

        _;

    }

    

    function rewardPerToken() public view returns (uint256) {

        if (stakedBalance == 0) {

            return rewardPerTokenStored;

        }

        return rewardPerTokenStored + ((block.timestamp - lastUpdateTime) * rewardRate * 1e18) / stakedBalance;

    }

    

    function earned(address account) public view returns (uint256) {

        return (stakedBalance[account] * (rewardPerToken() - userRewardPerTokenPaid[account])) / 

1e18 + rewards[account];

    }

    

    function stake(uint256 amount) public updateReward(msg.sender) {

        require(amount > 0, "Cannot stake 0 tokens");

        dappToken.transferFrom(msg.sender, address(this), amount);

        stakedBalance[msg.sender] += amount;

    }

    

    function withdraw(uint256 amount) public updateReward(msg.sender) {

        require(amount > 0, "Cannot withdraw 0 tokens");

        require(stakedBalance[msg.sender] >= amount, "Insufficient balance");

        dappToken.transfer(msg.sender, amount);

        stakedBalance[msg.sender] -= amount;

    }