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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)    - function mod(uint256 a, uint256 b)  contract Ownable    - function transferOwnership(address ne ... interface IERC20    - function totalSupply()    - function balanceOf(address who)    - function allowance(address owner, add ...    - function transfer(address to, uint256 ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...  contract ERC20 is IERC20,Ownable    - function totalSupply()    - function balanceOf(address owner)    - function isAccountFreezed(address _ad ...    - function allowance(    - function transfer(address to, uint256 ...    - function approve(address spender, uin ...    - function transferFrom(    - function _mint(address account, uint2 ...    - function _burn(address account, uint2 ...    - function _freezeAccount(address targe ...  contract BitsrentToken is ERC20 *    - function burnToken( uint256 amount)    - function freeze(address freezingAddre ...

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/**
 *Submitted for verification at Etherscan.io on 2018-10-07
*/

pragma solidity ^0.4.24;
/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts 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 Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}
/**
 * @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;
    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
      constructor() 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) onlyOwner public {
        require(newOwner != address(0));
        owner = newOwner;
    }

}

interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}
contract ERC20 is IERC20,Ownable {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowed;

  uint256 private _totalSupply;
  
  //Freeze parameter
  
  mapping (address => bool)  private _frozenAccount;
  
  // This notifies about accounts locked
  event FrozenFunds(address target, bool frozen);
  
  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param owner The address to query the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address owner) public view returns (uint256) {
    return _balances[owner];
  }
  
  /**
  * @dev Gets the freeze state of the specified address.
  * @param _address The address to query the freeze state of.
  * @return An bool representing the state of freeze.
  */
  function isAccountFreezed(address _address) public view returns (bool) {
    return _frozenAccount[_address];
  }
  

  /**
   * @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 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(value <= _balances[msg.sender]);
    require(!_frozenAccount[msg.sender]);  //sender should not be frozen Account
    require(!_frozenAccount[to]);  //receiver should not be frozen Account
    require(to != address(0));
    _balances[msg.sender] = _balances[msg.sender].sub(value);
    _balances[to] = _balances[to].add(value);
    emit Transfer(msg.sender, 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) {
    require(spender != address(0));

    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  /**
   * @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(value <= _balances[from]);
    require(value <= _allowed[from][msg.sender]);
     require(!_frozenAccount[from]);  //sender should not be frozen Account
    require(!_frozenAccount[to]);  //receiver should not be frozen Account
    require(to != address(0));

    _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 Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param account The account that will receive the created tokens.
   * @param amount The amount that will be created.
   */
  function _mint(address account, uint256 amount) internal {
    require(account != 0);
    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param account The account whose tokens will be burnt.
   * @param amount The amount that will be burnt.
   */
  function _burn(address account, uint256 amount) internal {
    require(account != 0);
    require(amount <= _balances[account]);
    _totalSupply = _totalSupply.sub(amount);
    _balances[account] = _balances[account].sub(amount);
    emit Transfer(account, address(0), amount);
  }
  
   
  /**
   * @dev Freezes the account from transferring tokens from own address to another
   * @param target The account which will be freezed.
   * @param freeze The decision to freeze.
   */
  function _freezeAccount(address target, bool freeze) internal {
    _frozenAccount[target] = freeze;
    emit FrozenFunds(target, freeze);
    }
  
}
contract BitsrentToken is ERC20{
    string public constant name = "Bitsrent";
    string public constant symbol = "BTR";
    uint8 public constant decimals = 18;
    //supply is 20 Billion
    uint256 public constant INITIAL_SUPPLY=20000000000*(10 ** uint256(decimals));
    
/**
   * @dev Constructor that gives msg.sender all of existing tokens.
   * minted only during contract initialization
   */
  constructor() public {
    _mint(msg.sender, INITIAL_SUPPLY);
  }
   /**
   * @dev function that burns an amount of the token of a given
   * account.
   * @param amount The amount that will be burnt.
   **/
  function burnToken( uint256 amount)  public {
      _burn(msg.sender,amount);
  }
  
   /**
   * @dev Freezes the account from transferring tokens from own address to another
   * can be called by owner only
   **/
  function freeze(address freezingAddress,bool decision)  onlyOwner public {
      _freezeAccount(freezingAddress,decision);
  }
  
}

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