// SPDX-License-Identifier: No License
pragma solidity 0.6.2;

// ----------------------------------------------------------------------------
// 'Bitcoin Currency' contract
//
// Symbol      : BTCY
// Name        : Bitcoin Currency
// Total supply: 9 800 000 000
// Decimals    : 18
// ----------------------------------------------------------------------------



/**
 * @title ERC20 interface
 */
interface ERC20
{
	function balanceOf(address who) external view returns (uint256);
	function transfer(address to, uint256 value) external returns (bool);
	function allowance(address owner, address spender) external view returns (uint256);
	function transferFrom(address from, address to, uint256 value) external returns (bool);
	function approve(address spender, 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);
}

/**
 * @title ERC223 interface
 */
interface ERC223
{
	function transfer(address to, uint256 value, bytes calldata data) external;
	event Transfer(address indexed from, address indexed to, uint256 value, bytes indexed data);
}

/*
Base class contracts willing to accept ERC223 token transfers must conform to.
*/

abstract contract ERC223ReceivingContract
{
	function tokenFallback(address _from, uint256 _value, bytes calldata _data) virtual external;
}

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

contract StandardToken is ERC20, ERC223
{
	using SafeMath for uint256;
        
	uint256 public totalSupply;

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

	event Burn(address indexed burner, uint256 value);

	function transfer(address _to, uint256 _value) external override 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);
		emit Transfer(msg.sender, _to, _value);
		return true;
	}

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

	function transferFrom(address _from, address _to, uint256 _value) external override 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);
		emit Transfer(_from, _to, _value);
		return true;
	}

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

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

	function increaseApproval(address _spender, uint256 _addedValue) external returns (bool)
	{
		allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
		emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
		return true;
	}

	function decreaseApproval(address _spender, uint256 _subtractedValue) external returns (bool)
	{
		uint256 oldValue = allowed[msg.sender][_spender];
		if (_subtractedValue > oldValue)
		{
			allowed[msg.sender][_spender] = 0;
		}
		else
		{
			allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
		}
		emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
		return true;
	}

	function transfer(address _to, uint256 _value, bytes calldata _data) external override
	{
		require(_value > 0 );
		if(isContract(_to))
		{
			ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
			receiver.tokenFallback(msg.sender, _value, _data);
		}
		balances[msg.sender] = balances[msg.sender].sub(_value);
		balances[_to] = balances[_to].add(_value);
		emit Transfer(msg.sender, _to, _value, _data);
	}

	function isContract(address _addr) view private returns (bool is_contract)
	{
		uint256 length;
		assembly
		{
			length := extcodesize(_addr)
		}
		return (length>0);
	}

	function burn(uint256 _value) external
	{
		require(_value <= balances[msg.sender]);

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

contract BTCY is StandardToken
{
	string public name = "Bitcoin Currency";
	string public symbol = "BTCY";
	uint8 public constant decimals = 18;
        address internal  _admin;

	uint public constant DECIMALS_MULTIPLIER = 10**uint(decimals);

	constructor(address _owner) public
	{
                 _admin = msg.sender;
		totalSupply = 9800000000 * DECIMALS_MULTIPLIER;
		balances[_owner] = totalSupply;
	  	emit Transfer(address(0), _owner, totalSupply);
	}


      modifier ownership()  {
    require(msg.sender == _admin);
        _;
    }



  //Admin can transfer his ownership to new address
  function transferownership(address _newaddress) public returns(bool){
      require(msg.sender==_admin);
      _admin=_newaddress;
      return true;
  }


}

{
  "compilationTarget": {
    "browser/BitcoinCurrency.sol": "BTCY"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}