Token

Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

library SafeMath    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)  contract ERC20Basic    - function totalSupply()    - function balanceOf(address who)    - function transfer(address to, uint256 ...  contract BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract StandardToken is ERC20, B ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...    - function allowance(address _owner, ad ...    - function increaseApproval(address _sp ...    - function decreaseApproval(address _sp ...    - function burn(uint256 _value)    - function _burn(address _who, uint256 ...  contract BlockcloudToken is Standa ... *

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2019-04-08
*/

pragma solidity ^0.4.25;

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;
  }
}

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);
}

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);
    emit 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];
  }

}

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);
}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;
    event Burn(address indexed burner, uint256 value);


  /**
   * @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);
    emit 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;
    emit 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);
    emit 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);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }


    /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }

}

contract BlockcloudToken is StandardToken {
  string public name    = "Blockcloud";
  string public symbol  = "BLOC";
  uint8 public decimals = 18;
  // ten billion in initial supply
  uint256 public constant INITIAL_SUPPLY = 10000000000;

  constructor() public {
    totalSupply_ = INITIAL_SUPPLY * (10 ** uint256(decimals));
    balances[msg.sender] = totalSupply_;
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"INITIAL_SUPPLY","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_value","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_subtractedValue","type":"uint256"}],"name":"decreaseApproval","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_addedValue","type":"uint256"}],"name":"increaseApproval","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"burner","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"}]

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

bzzr://5c1a027eee2175bfe579b11591b10a4968c808aeac6e030fbb94fdc2a83b03ef