如何发行ERC20代币?
网友回复
在 Chrome 插件商店搜索并安装 MetaMask。
MetaMask是钱包的一种,在chrome浏览器中,安装MetaMask插件即可,安装完成后,右上角会出现一个“狐狸头”的标志,点击该标志,打开钱包,第一步,创建账户,(创建账户只需要输入面密码即可,名称创建后可以随便改,该账户就是一个hash值,如何给自己创建的账户冲以太币呢,你可以通过在交易所买入一些ETH,然后转入即可)创建成功后,记住密码还有产生的几个随机单词(一定要记录下来)。运行后,用它来给我们初始化一个以太坊钱包。
准备一份ERC20的智能合约源码(github上有很多),一个简单的合约如下:
pragma solidity ^0.4.12; contract IMigrationContract { function migrate(address addr, uint256 nas) returns (bool success); } contract SafeMath { function safeAdd(uint256 x, uint256 y) internal returns(uint256) { uint256 z = x + y; assert((z >= x) && (z >= y)); return z; } function safeSubtract(uint256 x, uint256 y) internal returns(uint256) { assert(x >= y); uint256 z = x - y; return z; } function safeMult(uint256 x, uint256 y) internal returns(uint256) { uint256 z = x * y; assert((x == 0)||(z/x == y)); return z; } } contract Token { uint256 public totalSupply; function balanceOf(address _owner) constant returns (uint256 balance); function transfer(address _to, uint256 _value) returns (bool success); function transferFrom(address _from, address _to, uint256 _value) returns (bool success); function approve(address _spender, uint256 _value) returns (bool success); function allowance(address _owner, address _spender) constant returns (uint256 remaining); event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } /* ERC 20 token */ contract StandardToken is Token { function transfer(address _to, uint256 _value) returns (bool success) { if (balances[msg.sender] >= _value && _value > 0) { balances[msg.sender] -= _value; balances[_to] += _value; Transfer(msg.sender, _to, _value); return true; } else { return false; } } function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) { balances[_to] += _value; balances[_from] -= _value; allowed[_from][msg.sender] -= _value; Transfer(_from, _to, _value); return true; } else { return false; } } function balanceOf(address _owner) constant returns (uint256 balance) { return balances[_owner]; } function approve(address _spender, uint256 _value) returns (bool success) { allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); return true; } function allowance(address _owner, address _spender) constant returns (uint256 remaining) { return allowed[_owner][_spender]; } mapping (address => uint256) balances; mapping (address => mapping (address => uint256)) allowed; } contract BliBliToken is StandardToken, SafeMath { // metadata string public constant name = "BliBli"; string public constant symbol = "BCoin"; uint256 public constant decimals = 18; string public version = "1.0"; // contracts address public ethFundDeposit; // ETH存放地址 address public newContractAddr; // token更新地址 // crowdsale parameters bool public isFunding; // 状态切换到true uint256 public fundingStartBlock; uint256 public fundingStopBlock; uint256 public currentSupply; // 正在售卖中的tokens数量 uint256 public tokenRaised = 0; // 总的售卖数量token uint256 public tokenMigrated = 0; // 总的已经交易的 token uint256 public tokenExchangeRate = 625; // 625 BILIBILI 兑换 1 ETH // events event AllocateToken(address indexed _to, uint256 _value); // 分配的私有交易token; event IssueToken(address indexed _to, uint256 _value); // 公开发行售卖的token; event IncreaseSupply(uint256 _value); event DecreaseSupply(uint256 _value); event Migrate(address indexed _to, uint256 _value); // 转换 function formatDecimals(uint256 _value) internal returns (uint256 ) { return _value * 10 ** decimals; } // constructor function BliBliToken( address _ethFundDeposit, uint256 _currentSupply) { ethFundDeposit = _ethFundDeposit; isFunding = false; //通过控制预CrowdS ale状态 fundingStartBlock = 0; fundingStopBlock = 0; currentSupply = formatDecimals(_currentSupply); totalSupply = formatDecimals(10000000); balances[msg.sender] = totalSupply; if(currentSupply > totalSupply) throw; } modifier isOwner() { require(msg.sender == ethFundDeposit); _; } /// 设置token汇率 function setTokenExchangeRate(uint256 _tokenExchangeRate) isOwner external { if (_tokenExchangeRate == 0) throw; if (_tokenExchangeRate == tokenExchangeRate) throw; tokenExchangeRate = _tokenExchangeRate; } /// @dev 超发token处理 function increaseSupply (uint256 _value) isOwner external { uint256 value = formatDecimals(_value); if (value + currentSupply > totalSupply) throw; currentSupply = safeAdd(currentSupply, value); IncreaseSupply(value); } /// @dev 被盗token处理 function decreaseSupply (uint256 _value) isOwner external { uint256 value = formatDecimals(_value); if (value + tokenRaised > currentSupply) throw; currentSupply = safeSubtract(currentSupply, value); DecreaseSupply(value); } /// 启动区块检测 异常的处理 function startFunding (uint256 _fundingStartBlock, uint256 _fundingStopBlock) isOwner external { if (isFunding) throw; if (_fundingStartBlock >= _fundingStopBlock) throw; if (block.number >= _fundingStartBlock) throw; fundingStartBlock = _fundingStartBlock; fundingStopBlock = _fundingStopBlock; isFunding = true; } /// 关闭区块异常处理 function stopFunding() isOwner external { if (!isFunding) throw; isFunding = false; } /// 开发了一个新的合同来接收token(或者更新token) function setMigrateContract(address _newContractAddr) isOwner external { if (_newContractAddr == newContractAddr) throw; newContractAddr = _newContractAddr; } /// 设置新的所有者地址 function changeOwner(address _newFundDeposit) isOwner() external { if (_newFundDeposit == address(0x0)) throw; ethFundDeposit = _newFundDeposit; } ///转移token到新的合约 function migrate() external { if(isFunding) throw; if(newContractAddr == address(0x0)) throw; uint256 tokens = balances[msg.sender]; if (tokens == 0) throw; balances[msg.sender] = 0; tokenMigrated = safeAdd(tokenMigrated, tokens); IMigrationContract newContract = IMigrationContract(newContractAddr); if (!newContract.migrate(msg.sender, tokens)) throw; Migrate(msg.sender, tokens); // log it } /// 转账ETH 到BILIBILI团队 function transferETH() isOwner external { if (this.balance == 0) throw; if (!ethFundDeposit.send(this.balance)) throw; } /// 将BILIBILI token分配到预处理地址。 function allocateToken (address _addr, uint256 _eth) isOwner external { if (_eth == 0) throw; if (_addr == address(0x0)) throw; uint256 tokens = safeMult(formatDecimals(_eth), tokenExchangeRate); if (tokens + tokenRaised > currentSupply) throw; tokenRaised = safeAdd(tokenRaised, tokens); balances[_addr] += tokens; AllocateToken(_addr, tokens); // 记录token日志 } /// 购买token function () payable { if (!isFunding) throw; if (msg.value == 0) throw; if (block.number < fundingStartBlock) throw; if (block.number > fundingStopBlock) throw; uint256 tokens = safeMult(msg.value, tokenExchangeRate); if (tokens + tokenRaised > currentSupply) throw; tokenRaised = safeAdd(tokenRaised, tokens); balances[msg.sender] += tokens; IssueToken(msg.sender, tokens); //记录日志 } }有了智能合约,然后把它发布到以太坊网络中。
我们使用 Remix - Ethereum IDE 网站来发布智能合约。
MetaMask会把当前账户相关的信息填写到网站上,我们只需要把智能合约的代码粘贴进去,简单的改一下配置就可以了:
切换到 solidity 编译器 ,把网站当前使用的 solidity 编译器版本号改成和文件头一致,然后切换到 Compile 页面,点击Compile。
如果编译成功,图标上会显示绿色的对号
点击编译器下面的图标,设置环境为injected web3,账号是自己matemask钱包地址,其他默认
点开deploy下的向下的箭头
设置初始代币存入地址及数量,点击transact
弹出了metamask的合约部署页面,由于我余额不足,需要燃料费gas fee没法支付,只能中断。下面是其他网友的后续步骤,我没有测试过。 部署完毕后,可以看到合约的地址了,复制一下。
打开metamask钱包,点击添加代币
选择自定义代币
将合约地址粘贴进去,下一步
点击添加代币
这样就添加完了