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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 balanceOf(address who)    - function transfer(address to, uint256 ...  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract BasicToken is ERC20Basic    - 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 Ownable    - function Ownable()    - function transferOwnership(address ne ...  contract MintableToken is Standard ...    - function mint(address _to, uint256 _a ...    - function finishMinting()  contract BirdCoin is MintableToken *    - function transfer(address _to, uint _ ...    - function transferFrom(address _from, ...    - function unlockTokens()  contract BirdCoinCrowdsale is Owna ... *    - function BirdCoinCrowdsale()    - function allocateTokens(address addr, ...    - function validPurchase(uint256 provid ...    - function unlockTokens()

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/**
 *Submitted for verification at Etherscan.io on 2018-02-08
*/

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) {
    uint256 c = a / b;
    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;
  }
}

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);
}
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);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));

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

  function balanceOf(address _owner) public constant returns (uint256 balance) {
    return balances[_owner];
  }

}

contract StandardToken is ERC20, BasicToken {

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

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));

    uint256 _allowance = allowed[_from][msg.sender];

    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;
  }

  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

  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;
  }
}

contract Ownable {
  address public owner;

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

  function Ownable() {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    Transfer(0x0, _to, _amount);
    return true;
  }

  function finishMinting() onlyOwner public returns (bool) {
    mintingFinished = true;
    MintFinished();
    return true;
  }
}

contract BirdCoin is MintableToken {
    string public constant name = "BirdCoin";
    string public constant symbol = "BIRD";
    uint8 public constant decimals = 18;
    bool private isLocked = true;

    modifier canTransfer(address _sender, uint _value) {
        require(!isLocked);
        _;
    }

    function transfer(address _to, uint _value) canTransfer(msg.sender, _value) returns (bool success) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint _value) canTransfer(_from, _value) returns (bool success) {
        return super.transferFrom(_from, _to, _value);
    }

    function unlockTokens() onlyOwner {
        isLocked = false;
    }
}

contract BirdCoinCrowdsale is Ownable {
    using SafeMath for uint256;

    address constant ALLOCATOR_WALLET = 0x138e0c8f665f45D5A5969f661A2d73f65d5AC605;
    uint256 constant public CAP = 580158 ether;
    BirdCoin public token;

    bool public areTokensUnlocked = false;
    uint256 public tokensAllocated = 0;

    event TokenPurchase(address indexed beneficiary, uint256 amount);

    modifier onlyAllocator() {
        require(msg.sender == ALLOCATOR_WALLET);
        _;
    }

    function BirdCoinCrowdsale() {
        token = new BirdCoin();
    }

    function allocateTokens(address addr, uint256 tokenAmount) public onlyAllocator {
        require(validPurchase(tokenAmount));
        tokensAllocated = tokensAllocated.add(tokenAmount);
        token.mint(addr, tokenAmount);
        TokenPurchase(msg.sender, tokenAmount);
    }

    function validPurchase(uint256 providedAmount) internal constant returns (bool) {
        bool isCapReached = tokensAllocated.add(providedAmount) > CAP;

        if (isCapReached) {
            token.finishMinting();
        }

        return !isCapReached;
    }

    function unlockTokens() onlyOwner public {
        require(!areTokensUnlocked);
        token.unlockTokens();
        areTokensUnlocked = true;
    }
}

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