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 ERC20    - function balanceOf(address who)    - function transfer(address to, uint256 ...    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract BasicToken is ERC20    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)  contract StandardToken is ERC20, B ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...    - function allowance(address _owner, ad ...    - function increaseApproval (address _s ...    - function decreaseApproval (address _s ...  contract QQBToken is StandardToken *    - function QQBToken(address owner)

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2018-08-03
*/

pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    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;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    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 {
    uint256 public totalSupply;
    function balanceOf(address who) public constant returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    function allowance(address owner, address spender) public constant returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20 {
    using SafeMath for uint256;

    mapping(address => uint256) balances;

    /**
    * @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]);
        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 constant 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
 */
contract StandardToken is ERC20, BasicToken {

    mapping (address => mapping (address => uint256)) 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 amout of tokens to be transfered
     */
    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]);
        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // require (_value <= _allowance);
		balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = _allowance.sub(_value);
        Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * @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) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require((_value == 0) || (allowed[msg.sender][_spender] == 0));

        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 specifing the amount of tokens still avaible for the spender.
     */
    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowed[_owner][_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
   */
  function increaseApproval (address _spender, uint _addedValue)
    returns (bool success) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval (address _spender, uint _subtractedValue)
    returns (bool success) {
    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 QQBToken is Standard ERC20 token
 */
contract QQBToken is StandardToken {

    string public name = "Qualified Quality Block ";
    string public symbol = "QQB";
    uint public decimals = 8;
	
	uint256 public constant total= 1000000000 * (10 ** uint256(decimals));

	 function QQBToken(address owner) {
		balances[owner] = total;
		totalSupply = total;
  }
}

• 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":"total","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_subtractedValue","type":"uint256"}],"name":"decreaseApproval","outputs":[{"name":"success","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":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"owner","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"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"},{"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"}]

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

000000000000000000000000cbb43a1edb9d958d71e03f9e53426af0e1226969

-----Decoded View---------------
Arg [0] : owner (address): 0xcbb43a1EDB9d958D71e03F9E53426af0e1226969

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000cbb43a1edb9d958d71e03f9e53426af0e1226969

bzzr://e5ca9f98a8b39a40710739735b5c0483948d4f8ae2923347954677df2f63d482