前言

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　　目前區(qū)塊鏈?zhǔn)腔ヂ?lián)網(wǎng)中最最火的風(fēng)口,沒(méi)有之一。我周圍的很多朋友也加入了“炒幣”行列，但很不幸，幾乎都被“割韭菜”了。而經(jīng)過(guò)我的幾天研究，發(fā)現(xiàn)，如果自己要發(fā)行一種空氣幣，簡(jiǎn)直太簡(jiǎn)單了。只需要下面幾個(gè)步驟：

1.使用MetaMask

2.找Solidity代碼模板

3.部署智能合約

4.空氣幣轉(zhuǎn)賬測(cè)試

一、MetaMask

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在Chrome瀏覽器的網(wǎng)上應(yīng)用店搜索MetaMask，如下圖所示，如果搜到小狐貍logo的插件就對(duì)了，這就是以太坊瀏覽器(如果有無(wú)法打開(kāi)Chrome網(wǎng)上應(yīng)用店的朋友，就去搜索怎樣科學(xué)上網(wǎng)的教程)。

把它添加到你的Chrome中。

打開(kāi)瀏覽器的右上角的圖標(biāo)快捷菜單中，打開(kāi)這個(gè)插件。如下圖，選擇Ropsten測(cè)試網(wǎng)絡(luò)，并輸入密碼登錄。第一次登陸需要設(shè)置密碼。

默認(rèn)會(huì)幫你創(chuàng)建一個(gè)賬號(hào)，如果需要再創(chuàng)建賬號(hào)，如下圖所示，點(diǎn)擊Crreate Account。

默認(rèn)賬號(hào)里是沒(méi)有以太幣的，如果選擇的是主網(wǎng)(Main Ethereum Network)，則需要從別的賬號(hào)里轉(zhuǎn)一些以太幣過(guò)來(lái)。而這里，我用的是測(cè)試網(wǎng)絡(luò)，如下圖所示，點(diǎn)擊“BUY”按鈕，去免費(fèi)零一些以太幣來(lái)。

再點(diǎn)擊“ROPSTEN TEST FAUCET”

如下圖使用，打開(kāi)了一個(gè)網(wǎng)頁(yè)

狂點(diǎn)“request 1 ether from faucet”按鈕，每次點(diǎn)擊，就會(huì)獲得免費(fèi)的1個(gè)以太幣。大概等5分鐘左右時(shí)間，測(cè)試用的幣就會(huì)到帳了。再檢查你的賬戶余額，就不是零了。

二、找代碼模板

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如下圖所示，打開(kāi)火幣Pro網(wǎng)站：https://www.huobipro.com/zh-cn/btc_usdt/exchange/

在其創(chuàng)新區(qū)里，幾乎有90%的幣都是基于ERC20智能合約發(fā)行的空氣幣。這里插一句題外話，如果有炒幣的朋友，就要小心這些空氣幣。

我們拿前段時(shí)間炒的最火的幣——EDU為例，來(lái)講一下怎么發(fā)幣。

如下圖所示，我們找到區(qū)塊查詢的網(wǎng)址，這個(gè)網(wǎng)址就是以太坊ERC20這個(gè)智能合約發(fā)型Token的交易查詢地址。

上面的幣種類簡(jiǎn)介和白皮書(shū)不要看，都是忽悠人的。大家記號(hào)了，這些都是空氣幣，不需要“挖”就能有幣。而誰(shuí)發(fā)行的幣，幣就歸誰(shuí)所有。空氣幣通常會(huì)打著教育和醫(yī)療的幌子來(lái)圈錢(qián)。

如下圖所示，我們打開(kāi)這個(gè)網(wǎng)站：https://etherscan.io/address/0xf263292e14d9d8ecd55b58dad1f1df825a874b7

Token名是EduCion，我們點(diǎn)進(jìn)去看，如下圖示所，進(jìn)去這個(gè)網(wǎng)頁(yè)：https://etherscan.io/token/0xf263292e14d9d8ecd55b58dad1f1df825a874b7c

它的創(chuàng)建者一次性收到了"15,000,000,000"的代幣，然后就以“8xx,xxx,xxx”的數(shù)量轉(zhuǎn)給了其他賬號(hào)。看到這，我想，大家應(yīng)該都懂了吧。

好，我們回到剛才的頁(yè)面，點(diǎn)擊“Code”標(biāo)簽頁(yè)。

復(fù)制里面的代碼，作為我們發(fā)行空氣幣的代碼模板。

三、部署智能合約

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如下圖所示，我們打開(kāi)網(wǎng)址：http://remix.ethereum.org

這個(gè)地址是以太坊Solidity智能合約語(yǔ)言的在線編輯器。并把剛才復(fù)制的代碼粘貼進(jìn)去，并修改以下幾處地方：

分別修改：合約名稱，代幣名稱，代幣符號(hào)，小數(shù)位數(shù)，發(fā)行總量，構(gòu)造函數(shù)名稱。好了就這么簡(jiǎn)單，以下就是我修改后的代碼：

其中，name是代碼名稱，symbol是代幣符號(hào)，decimals是小數(shù)位數(shù)，INITIAL_SUPPLY是發(fā)型總量。

我分別修改為：LiuDong幣，LDC，18位，12,000,000,000量。

完整代碼如下：

pragma solidity ^0.4.18;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  /**
  * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}


/**
 * @title SimpleToken
 * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
 * Note they can later distribute these tokens as they wish using `transfer` and other
 * `StandardToken` functions.
 */
contract LiudongCoin is StandardToken {

    string public constant name = "LiudongCoin"; // solium-disable-line uppercase
    string public constant symbol = "LDC"; // solium-disable-line uppercase
    uint8 public constant decimals = 18; // solium-disable-line uppercase

    uint256 public constant INITIAL_SUPPLY = 12 * (10 ** 9) * (10 ** uint256(decimals));

    /**
    * @dev Constructor that gives msg.sender all of existing tokens.
    */
    function LiudongCoin() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        Transfer(0x0, msg.sender, INITIAL_SUPPLY);
    }

}

View Code

在Solidity編輯器的右邊，切換到Run標(biāo)簽頁(yè)，選擇到LiuDongCion合約，點(diǎn)擊部署(Deploy)按鈕。如下圖示所，彈出MetaMask插件，點(diǎn)擊SUBMIT按鈕，支付“0.001362“的以太幣就能完畢這個(gè)智能合約的部署。

看吧，才花這么點(diǎn)錢(qián)，這就發(fā)行了很多空氣幣。

等待片刻，Solidity編輯器的底部控制臺(tái)處打印出網(wǎng)站：https://ropsten.etherscan.io/tx/0x2c78cab134e7ce18e12a39f9a4b3ea2687ff017da12e85b1ea2e7f47af63b7f8

這說(shuō)明智能合約部署好了，也就是已經(jīng)寫(xiě)入到區(qū)塊鏈接中了。

我們打開(kāi)這個(gè)頁(yè)面，就發(fā)現(xiàn)，自己的代幣已經(jīng)部署成功了。

如下圖所示，點(diǎn)擊合約的地址：

LiuDong幣已經(jīng)部署上去了。

四、空氣幣轉(zhuǎn)賬測(cè)試

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如下圖所示，合約地址是：0xA06263304AbEBAcf4f885Faf9630ea697E6901a9

把這個(gè)地址復(fù)制到Solidity編輯器的At Address中，遍出現(xiàn)了該智能合約的函數(shù)。

在banlanceOf中輸入合約創(chuàng)建者的地址：0x9dd6bd0d543ff85a1782d683d0c9a63964fc00dd

1200xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx，這么多的幣的余額就出來(lái)了。

那么，現(xiàn)在來(lái)往別的賬號(hào)里轉(zhuǎn)賬試試。如下圖所示，找到剛才創(chuàng)建的賬號(hào)，點(diǎn)擊復(fù)制賬號(hào)地址菜單：

復(fù)制地址到轉(zhuǎn)賬(transfer)的輸入框中，輸入0x7DB59BE385dA0D6B5BB5B99626Cb1a11f5f5eCd6,12000000000000

代表的是轉(zhuǎn)入的賬號(hào)和轉(zhuǎn)入的數(shù)量，如下圖所示，點(diǎn)擊transfer按鈕，彈出MetaMask，點(diǎn)擊提交按鈕：

稍等片刻，查看交易情況。該交易就記錄在區(qū)塊鏈中了：

然后，我們查詢一下剛才轉(zhuǎn)入賬號(hào)的余額。

有兩種方式：

一種是輸入網(wǎng)址：https://ropsten.etherscan.io/token/0xa06263304abebacf4f885faf9630ea697e6901a9?a=0x7db59be385da0d6b5bb5b99626cb1a11f5f5ecd6

網(wǎng)址的規(guī)則是：Token地址 + ?a=轉(zhuǎn)入的地址，如下圖所示。余額為：0.000012 個(gè)LDC。

另一種方式是在Soldity編輯器中的balanceOf輸入轉(zhuǎn)入賬號(hào)的地址，并調(diào)用這個(gè)函數(shù)。如下圖所示：

好了，以上發(fā)行空氣幣的整個(gè)過(guò)程就講完了，是不是覺(jué)得很簡(jiǎn)單呢？

如果你覺(jué)得我的博客對(duì)你有幫助，可以給我點(diǎn)兒打賞，左側(cè)微信，右側(cè)支付寶。

有可能就是你的一點(diǎn)打賞會(huì)讓我的博客寫(xiě)的更好:)

作者：劉冬.NET 博客地址：http://www.cnblogs.com/GoodHelper/ 歡迎轉(zhuǎn)載，但須保留版權(quán)

總結(jié)

以上是生活随笔為你收集整理的零门槛，包教会。让你在5分钟内使用以太坊ERC20智能合约发行属于自己的空气币的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。