创建一个基于以太坊平台的分红币MNC，根据持有的代币数量，进行分红的算法。github地址：
https://github.com/lxr1907/MNC
1.使用以太坊根据比例换购token MNC
2.定期根据使用用户资金购买的矿机挖ETH，打入该合约，触发分红方法根据token持有比例分红
3.衰减，由于矿机有折旧衰减损坏的概率，token会随着持有时间而衰减。
代码如下
pragma solidity ^0.4.19; contract owned { address public owner; function owned() public { owner = msg.sender; } modifier onlyOwner { require(msg.sender == owner); _; } function transferOwnership(address newOwner) onlyOwner public { owner = newOwner; } } contract LxrContract is owned{ struct miner{ //MNC余额 uint256 balance; //挖矿份额 uint256 mining; //上一次分红，衰减日期 uint256 lastDate; //上一次收益 uint256 lastBonus; } //虚拟币名称 string public name; //虚拟币名称缩写 string public symbol; //18 decimals 极力推荐使用默认值，尽量别改 uint8 public constant decimals = 18; //和以太坊兑换的汇率 uint32 public ethExchangeRate = 1000; //总发行 uint256 public totalSupply; //创始人保留百分比 uint8 constant ownerInitial=10; //合约拥有者 address public owner; //创建所有账户余额数组 mapping (address => miner) public miners; //挖矿需要募集的挖矿资金,100个eth，后续可以增加 uint256 public collectAmountLeft=ethExchangeRate*100; //0.01个ETH起计算挖矿收益 uint256 startMiningMin=ethExchangeRate/100; //挖矿人地址数组 address[] minersArray; //分红日期 uint256 public bonusTimePoint; //分红历史总数 uint256 public bonusTotal; //阶段分红累计数，分红后清零 uint256 public bonusPeriodCumulative; //每日折旧率千分比,例如每日千分之2，一年后48.15%，3，一年后剩余33%，4一年后23.15% uint16 depreciationRate=3; //每次折旧时间，测试情况下设置为1分钟以便调试 uint256 depreciationTime=1 minutes; //从挖矿账户提现手续费百分比 uint miningDepositFee=30; // 在区块链上创建一个公共事件，它触发就会通知所有客户端 event Transfer(address indexed from, address indexed to, uint256 value); event BalanceToMine(address indexed from, uint256 value); event MiningDeposit(address indexed from, uint256 value, uint256 fee); event TransferMining(address indexed from,address indexed to, uint256 value); event Bonus(address indexed to, uint256 value); event Burn(address indexed from, uint256 value); /** * 初始化合约，将最初的令牌中的一部分打入创建者的账户中 * @param initialSupply 初始发行量 * @param tokenName 虚拟币名称 * @param tokenSymbol 虚拟币名称缩写 */ function LxrContract( uint256 initialSupply, string tokenName, string tokenSymbol ) public { //初始化合约所有人 owner=msg.sender; //合约账户余额初始 _mintToken(this,initialSupply-initialSupply * ownerInitial/100); //所有人账户余额初始 _mintToken(owner,initialSupply * ownerInitial/100); // 设置显示名称 name = tokenName; // 设置显示缩写，例如比特币是BTC symbol = tokenSymbol; //初始化分红时间点 bonusTimePoint=now/depreciationTime; } /** * 内部转账，只能被该合约调用 */ function _transfer(address _from, address _to, uint _value) internal { // 检查发送者是否拥有足够的币 require(miners[_from].balance >= _value); // 检查越界 require(miners[_to].balance + _value > miners[_to].balance); // 从发送者扣币 miners[_from].balance -= _value; // 给接收者加相同数量币 miners[_to].balance += _value; //通知 Transfer(_from, _to, _value); } /** * 账户余额兑换挖矿份额 */ function balanceToMining( uint256 _value) public { //检查挖矿募集剩余 require(collectAmountLeft > 0); require(miners[msg.sender].balance > 0); uint256 effectValue=_value; //传0或不传则所有余额兑换挖矿份额 if(effectValue==0){ effectValue=miners[msg.sender].balance/(10**uint256(decimals)); } // 检查越界 require(miners[msg.sender].mining + effectValue > miners[msg.sender].mining); // 检查发送者是否拥有足够的币 if(miners[msg.sender].balance < effectValue){ effectValue=miners[msg.sender].balance/(10**uint256(decimals)); } //检查挖矿募集剩余是否足够,不足只转一部分 if(collectAmountLeft < _value){ effectValue=collectAmountLeft; } //账户ETH余额不足，无法投资 if(this.balance<effectValue* 10 ** uint256(decimals)/ethExchangeRate){ return; } //如果不存在，将该挖矿地址加入数组，用于以后遍历访问 addToMinersArray(msg.sender); // 从余额销毁 burn(msg.sender,effectValue); // 给挖矿账户加相同数量币 miners[msg.sender].mining += effectValue* 10 ** uint256(decimals); //募集剩余资金减少 collectAmountLeft -=effectValue; //将挖矿所需以太坊转到拥有者账户，以便所有者使用这些eth购买矿机挖矿 owner.transfer(effectValue* 10 ** uint256(decimals)/ethExchangeRate); //通知 BalanceToMine(msg.sender, effectValue); } /** * * 将挖矿份额转换为账户余额，需要按百分比支付手续费 * * @param _value 提出金额 */ function miningDeposit( uint256 _value) public { uint depositFee=_value* 10 ** uint256(decimals)*miningDepositFee/100; uint depositValue=_value* 10 ** uint256(decimals); // 检查发送者是否拥有足够的币 require(miners[msg.sender].mining >= depositValue); // 检查越界 require(miners[msg.sender].balance + depositValue > miners[msg.sender].balance); // 从挖矿余额扣除 miners[msg.sender].mining -= depositValue; //挖矿余额剩余为0，全部提现，则时间重置 if(miners[msg.sender].mining==0){ miners[msg.sender].lastDate=0; } //给账户加相同数量币,扣除一定百分比手续费 miners[msg.sender].balance += depositValue-depositFee; //将手续费支付给合约管理员 miners[owner].balance += depositFee; //通知 MiningDeposit(msg.sender, depositValue,depositFee); } //将该挖矿地址加入数组 function addToMinersArray(address _miner) internal{ //如果不存在，将该挖矿地址加入数组，用于以后遍历访问 bool hasAdd=false; for (uint i = 0; i < minersArray.length; i++) { if(minersArray[i]==_miner){ hasAdd=true; break; } } if(!hasAdd){ minersArray.push(_miner); } } /** * 将挖矿份额转让 */ function transferMining(address _to, uint256 _value) public { // 检查发送者是否拥有足够的币 require(miners[msg.sender].mining >= _value); // 检查越界 require(miners[_to].mining + _value > miners[_to].mining); //将该挖矿地址加入数组 addToMinersArray(_to); // 从发送者扣币 miners[msg.sender].mining -= _value; // 给接收者加相同数量币 miners[_to].mining += _value; TransferMining(msg.sender,_to, _value); } /** *计算总挖矿份额 */ function getMiningAmountTotal() public view returns ( uint256 _totalMinigAmount){ for (uint i = 0; i < minersArray.length; i++) { uint256 miningAmount = miners[minersArray[i]].mining; _totalMinigAmount += miningAmount; } _totalMinigAmount=_totalMinigAmount/(10**uint256(decimals)); } /** *根据挖矿份额给每个人分红 ,匿名方法，直接转账触发 * bonusMNCtoMiner */ function () payable public { //阶段收益MNC bonusPeriodCumulative += msg.value*ethExchangeRate; require(bonusPeriodCumulative>0); //该阶段已经分红过，只累加分红数量 if(bonusTimePoint>=now/depreciationTime){ return; } //更新分红时间点 bonusTimePoint=now/depreciationTime; uint256 totalMinigAmount=getMiningAmountTotal(); if(totalMinigAmount==0){ return; } //加发行量 _mintToken(this,bonusPeriodCumulative/(10**uint256(decimals))); //总历史收益增加 bonusTotal += bonusPeriodCumulative; //计算每个人的收益 for (uint i = 0; i < minersArray.length; i++) { uint256 miningAmount = miners[minersArray[i]].mining/(10**uint256(decimals)); if(miningAmount<startMiningMin){ continue; } //矿机折旧衰减 if(miners[minersArray[i]].lastDate==0){ //第一次不折旧，记录时间 miners[minersArray[i]].lastDate=now/depreciationTime; //第一次也不分红 continue; }else{ //计算出衰减段数 uint256 depreciationPeriods=now/depreciationTime-miners[minersArray[i]].lastDate; //每段衰减一次 for(uint m=0;m<depreciationPeriods;m++) miners[minersArray[i]].mining=miners[minersArray[i]].mining* (1000-depreciationRate)/1000; //更新时间 miners[minersArray[i]].lastDate=now/depreciationTime; } //分红数量 uint256 oneBonus = bonusPeriodCumulative*miningAmount/totalMinigAmount; miners[minersArray[i]].lastBonus=oneBonus; } //阶段收益清零 bonusPeriodCumulative=0; //发放收益 for (uint j = 0; j < minersArray.length; j++) { bonusToken(minersArray[j]); } } /** *奖励挖矿收益MNC * */ function bonusToken(address _to) internal{ miners[_to].balance+= miners[_to].lastBonus ; Bonus(_to, miners[_to].lastBonus*(10**uint256(decimals))); } /** * 发送MNC * * 从你的账户发送个`_value` 令牌到 `_to` * * @param _to 接收地址 * @param _value 发送数量 */ function transfer(address _to, uint256 _value) public { _transfer(msg.sender, _to, _value); } /** *增发MNC * */ function _mintToken(address _to, uint256 mintedAmount) internal{ totalSupply += mintedAmount*(10**uint256(decimals)); miners[_to].balance+= mintedAmount*(10**uint256(decimals)); Transfer(0, _to, mintedAmount*(10**uint256(decimals))); } //增发MNC function MintToken( uint256 mintedAmount) onlyOwner public{ _mintToken(this,mintedAmount); } /** *销毁MNC * */ function burn( address _from,uint256 mintedAmount) internal{ totalSupply -= mintedAmount*(10**uint256(decimals)); miners[_from].balance-= mintedAmount*(10**uint256(decimals)); Burn(_from, mintedAmount*(10**uint256(decimals))); } /** * *增加募集金额 * @param amount 需要的MNC数量 */ function addCollection( uint256 amount) onlyOwner public{ collectAmountLeft += amount; } /// 使用以太坊购买token function buy() payable public { uint amount = msg.value; //合约余额充足 require(miners[this].balance>=amount * ethExchangeRate); _transfer( this,msg.sender, amount * ethExchangeRate); } //出售token换回以太坊 function sell(uint256 amount) public { _transfer(msg.sender, this, amount* 10 ** uint256(decimals)); msg.sender.transfer(amount* 10 ** uint256(decimals)/ethExchangeRate); } //调整和以太坊的兑换比例 function setEthMncRate(uint32 _rate) onlyOwner public{ //调整幅度限制到原价20% require(_rate>ethExchangeRate*8/10); require(_rate<ethExchangeRate*12/10); ethExchangeRate=_rate; } //折旧率千分比调整 function setDepreciationRate(uint16 _rate) onlyOwner public{ //调整幅度限制到100% require(_rate>depreciationRate/2); require(_rate<depreciationRate*2); require(_rate<1000); depreciationRate=_rate; } //折旧时间调整 function setDepreciationTime(uint8 _rate) onlyOwner public{ require(_rate!=0); //天数 depreciationTime=_rate*1 days; //初始化分红时间点 bonusTimePoint=now/depreciationTime; } //-------------------------------------------一下为调试方法 //获取当前分红时间 function getBonusTimeNow() public view returns(uint256 _time){ _time= now/depreciationTime; } /** * *获取合约余额 */ function getContractBalance( ) public view returns (uint _contractBalance,uint _ethBanlance){ _contractBalance=miners[this].balance/(10**uint256(decimals)); _ethBanlance=this.balance/(10**uint256(decimals)); } /** * *获取我的余额 */ function getMyBalance( ) public view returns (uint _myBalance,uint _myMining,uint _lastBonus,uint _date){ _myBalance=miners[msg.sender].balance/(10**uint256(decimals)); _myMining=miners[msg.sender].mining/(10**uint256(decimals)); _lastBonus=miners[msg.sender].lastBonus/(10**uint256(decimals)); _date=miners[msg.sender].lastDate; } }
给我的ETH捐赠地址：0xdc834D429b3098f0568Af873c2d73b08790BF677