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ParentTxHash Block Age From To Value
Contract Source Code Verified (Exact match)
Contract Name: QuantstampToken
Compiler Version: v0.4.18+commit.9cf6e910
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.15;


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

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

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}




/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}



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





/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  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 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;



  /**
  * @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));

    // 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 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
 * @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)) 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));

    uint256 _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 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 constant 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 Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is StandardToken {

    event Burn(address indexed burner, uint256 value);

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint256 _value) public {
        require(_value > 0);

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(burner, _value);
    }
}

// Quantstamp Technologies Inc. (info@quantstamp.com)



/**
 * The Quantstamp token (QSP) has a fixed supply and restricts the ability
 * to transfer tokens until the owner has called the enableTransfer()
 * function.
 *
 * The owner can associate the token with a token sale contract. In that
 * case, the token balance is moved to the token sale contract, which
 * in turn can transfer its tokens to contributors to the sale.
 */
contract QuantstampToken is StandardToken, BurnableToken, Ownable {

    // Constants
    string  public constant name = "Quantstamp Token";
    string  public constant symbol = "QSP";
    uint8   public constant decimals = 18;
    uint256 public constant INITIAL_SUPPLY      = 1000000000 * (10 ** uint256(decimals));
    uint256 public constant CROWDSALE_ALLOWANCE =  650000000 * (10 ** uint256(decimals));
    uint256 public constant ADMIN_ALLOWANCE     =  350000000 * (10 ** uint256(decimals));

    // Properties
    uint256 public crowdSaleAllowance;      // the number of tokens available for crowdsales
    uint256 public adminAllowance;          // the number of tokens available for the administrator
    address public crowdSaleAddr;           // the address of a crowdsale currently selling this token
    address public adminAddr;               // the address of the token admin account
    bool    public transferEnabled = false; // indicates if transferring tokens is enabled or not

    // Modifiers
    modifier onlyWhenTransferEnabled() {
        if (!transferEnabled) {
            require(msg.sender == adminAddr || msg.sender == crowdSaleAddr);
        }
        _;
    }

    /**
     * The listed addresses are not valid recipients of tokens.
     *
     * 0x0           - the zero address is not valid
     * this          - the contract itself should not receive tokens
     * owner         - the owner has all the initial tokens, but cannot receive any back
     * adminAddr     - the admin has an allowance of tokens to transfer, but does not receive any
     * crowdSaleAddr - the crowdsale has an allowance of tokens to transfer, but does not receive any
     */
    modifier validDestination(address _to) {
        require(_to != address(0x0));
        require(_to != address(this));
        require(_to != owner);
        require(_to != address(adminAddr));
        require(_to != address(crowdSaleAddr));
        _;
    }

    /**
     * Constructor - instantiates token supply and allocates balanace of
     * to the owner (msg.sender).
     */
    function QuantstampToken(address _admin) {
        // the owner is a custodian of tokens that can
        // give an allowance of tokens for crowdsales
        // or to the admin, but cannot itself transfer
        // tokens; hence, this requirement
        require(msg.sender != _admin);

        totalSupply = INITIAL_SUPPLY;
        crowdSaleAllowance = CROWDSALE_ALLOWANCE;
        adminAllowance = ADMIN_ALLOWANCE;

        // mint all tokens
        balances[msg.sender] = totalSupply;
        Transfer(address(0x0), msg.sender, totalSupply);

        adminAddr = _admin;
        approve(adminAddr, adminAllowance);
    }

    /**
     * Associates this token with a current crowdsale, giving the crowdsale
     * an allowance of tokens from the crowdsale supply. This gives the
     * crowdsale the ability to call transferFrom to transfer tokens to
     * whomever has purchased them.
     *
     * Note that if _amountForSale is 0, then it is assumed that the full
     * remaining crowdsale supply is made available to the crowdsale.
     *
     * @param _crowdSaleAddr The address of a crowdsale contract that will sell this token
     * @param _amountForSale The supply of tokens provided to the crowdsale
     */
    function setCrowdsale(address _crowdSaleAddr, uint256 _amountForSale) external onlyOwner {
        require(!transferEnabled);
        require(_amountForSale <= crowdSaleAllowance);

        // if 0, then full available crowdsale supply is assumed
        uint amount = (_amountForSale == 0) ? crowdSaleAllowance : _amountForSale;

        // Clear allowance of old, and set allowance of new
        approve(crowdSaleAddr, 0);
        approve(_crowdSaleAddr, amount);

        crowdSaleAddr = _crowdSaleAddr;
    }

    /**
     * Enables the ability of anyone to transfer their tokens. This can
     * only be called by the token owner. Once enabled, it is not
     * possible to disable transfers.
     */
    function enableTransfer() external onlyOwner {
        transferEnabled = true;
        approve(crowdSaleAddr, 0);
        approve(adminAddr, 0);
        crowdSaleAllowance = 0;
        adminAllowance = 0;
    }

    /**
     * Overrides ERC20 transfer function with modifier that prevents the
     * ability to transfer tokens until after transfers have been enabled.
     */
    function transfer(address _to, uint256 _value) public onlyWhenTransferEnabled validDestination(_to) returns (bool) {
        return super.transfer(_to, _value);
    }

    /**
     * Overrides ERC20 transferFrom function with modifier that prevents the
     * ability to transfer tokens until after transfers have been enabled.
     */
    function transferFrom(address _from, address _to, uint256 _value) public onlyWhenTransferEnabled validDestination(_to) returns (bool) {
        bool result = super.transferFrom(_from, _to, _value);
        if (result) {
            if (msg.sender == crowdSaleAddr)
                crowdSaleAllowance = crowdSaleAllowance.sub(_value);
            if (msg.sender == adminAddr)
                adminAllowance = adminAllowance.sub(_value);
        }
        return result;
    }

    /**
     * Overrides the burn function so that it cannot be called until after
     * transfers have been enabled.
     *
     * @param _value    The amount of tokens to burn in mini-QSP
     */
    function burn(uint256 _value) public {
        require(transferEnabled || msg.sender == owner);
        require(balances[msg.sender] >= _value);
        super.burn(_value);
        Transfer(msg.sender, address(0x0), _value);
    }
}

    Contract ABI  
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,{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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    Constructor Arguments (ABI-encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000092af6067f7fe2ae488439c2b79ef7f8fc57e5ad3

-----Decoded View---------------
Found 1 constructor arguments :
Arg [0] : 00000000000000000000000092af6067f7fe2ae488439c2b79ef7f8fc57e5ad3


   Swarm Source:
bzzr://f0dc1878c30b4496254039f5326be976486c089f1eb0254d01952ee6c9291922

 

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