Token

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 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 ... 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) library Math    - function max(uint a, uint b)    - function min(uint a, uint b)  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 _sp ...    - function decreaseApproval(address _sp ...  contract Ownable    - function Ownable()    - function transferOwnership(address ne ...  contract MintableToken is Standard ...    - function mint(address _to, uint256 _a ...    - function finishMinting()  contract BuronCoin is MintableToke ... *  contract Crowdsale is Ownable    - function bytesToAddress(bytes source)    - function Crowdsale(address _multisig, ...    - function buyTokens(address to, addres ...    - function()

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/**
 *Submitted for verification at Etherscan.io on 2017-12-29
*/

pragma solidity ^0.4.18;

/**
 * @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 view 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 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 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;
  }
  
}
library Math {
  function max(uint a, uint b) pure internal returns (uint) {
    if (a > b) return a;
    else return b;
  }
  function min(uint a, uint b) pure internal returns (uint) {
    if (a < b) return a;
    else return b;
  }
}

/**
 * @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));
    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];
  }

  /**
   * 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) public returns (bool) {
    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) 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 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() public {
    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) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */

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

  bool public mintingFinished = false;


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

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  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(address(0), _to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    MintFinished();
    return true;
  }
}

//---------------------------------------------------------------------------------

contract BuronCoin is MintableToken {
    
    string public constant name = "Buron Coin";
    
    string public constant symbol = "BURC";
    
    uint32 public constant decimals = 4;
    
}

contract Crowdsale is Ownable {
    
	struct tier {
        uint cap;
        uint rate;
    }
	
    using SafeMath for uint;
	using Math for uint;
    
	BuronCoin public token = new BuronCoin();
	
    address multisig; 		
	uint restrictedAmount; 	
    address restricted;		
	uint price;				
	bool saleOn;		
	uint public sold;	
    
	tier[7] tiers; 
  
	function bytesToAddress(bytes source) internal pure returns(address) {
		uint result;
		uint mul = 1;
		for(uint i = 20; i > 0; i--) {
		  result += uint8(source[i-1])*mul;
		  mul = mul*256;
		}
		return address(result);
	}
  
    function Crowdsale(address _multisig, address _restricted) public {
        multisig = _multisig;
        restricted = _restricted;
		restrictedAmount=231000000000; 		
        price = 17700000000; 
		
		tiers[0]=tier(10000000000,50);
		tiers[1]=tier(30000000000,30);
		tiers[2]=tier(60000000000,25);
		tiers[3]=tier(110000000000,20);
		tiers[4]=tier(190000000000,15);
		tiers[5]=tier(320000000000,10);
		tiers[6]=tier(530000000000,5);
		
		sold=0;
		saleOn=true;
		
		token.mint(restricted, restrictedAmount);	
    }

    modifier saleIsOn() {
    	require(saleOn && sold<tiers[6].cap);
    	_;
    }
	
    function buyTokens(address to, address referer) public saleIsOn payable {
		require(msg.value>0);
	
		if (to==address(0x0))
			to=msg.sender;
	
        multisig.transfer(msg.value);	
		
		
        uint tokensBase = msg.value.div(price);
		
		uint tokensForBonus=tokensBase;
		uint tmpSold=sold;
		uint currentTier=0;
		uint bonusTokens=0;
		
		
		while(tiers[currentTier].cap<tmpSold)
			currentTier++;
		
		uint currentTierTokens=0;
		while((tokensForBonus>0) && (currentTier<7))
		{
			currentTierTokens=Math.min(tiers[currentTier].cap.sub(tmpSold), tokensForBonus); 		
			bonusTokens=bonusTokens.add(currentTierTokens.mul(tiers[currentTier].rate).div(100));   
			tmpSold=tmpSold.add(currentTierTokens);									   			
			
			tokensForBonus=tokensForBonus.sub(currentTierTokens);					   			
			currentTier++;
		}
		
		
		token.mint(to, tokensBase.add(bonusTokens));  						   			
		sold=sold.add(tokensBase);											   		
		
	
		if (referer != address(0x0))
		if (referer != msg.sender)	
		{
		  uint refererTokens = tokensBase.mul(3).div(100);	
		  token.mint(referer, refererTokens);				
		}		
		
		if (sold>=tiers[6].cap)													   	  
		{
			saleOn=false;
			token.finishMinting();
		}
    }
	
    function() external payable {
		
		
		address referer;
		if(msg.data.length == 20)
			referer = bytesToAddress(bytes(msg.data));
		else
			referer=address(0x0);
			
        buyTokens(address(0x0), referer);
    }
}

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