pragma solidity ^0.5.8;

library SafeMath {
    function add(uint a, uint b) internal pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function sub(uint a, uint b) internal pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function mul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function div(uint a, uint b) internal pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}

contract ERC20Interface {
    function totalSupply() public view returns (uint);
    function balanceOf(address tokenOwner) public view returns (uint balance);
    function allowance(address tokenOwner, address spender) public view returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}

contract Owned {
    address public owner;
    address public newOwner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor() public {
        owner = msg.sender;
    }

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

    function transferOwnership(address _newOwner) public onlyOwner {
        newOwner = _newOwner;
    }
    function acceptOwnership() public {
        require(msg.sender == newOwner);
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

contract CubiatStableToken is ERC20Interface, Owned {
    using SafeMath for uint;

    string public symbol;
    string public name;
    uint8 public decimals;
    uint _totalSupply;

    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;
    mapping(address => bool) frozen;

    event Burn(address indexed _from, uint value);
    event Freeze(address indexed _from);
    event Unfreeze(address indexed _from);

    constructor() public {
        symbol = "NCASH";
        name = "Cubiat Stable Token";
        decimals = 18;
        _totalSupply = 100000000000 * 10**uint(decimals);
        balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function totalSupply() public view returns (uint) {
        return _totalSupply;
    }


    function balanceOf(address tokenOwner) public view returns (uint balance) {
        return balances[tokenOwner];
    }

    //http://vessenes.com/the-erc20-short-address-attack-explained/
    modifier onlyPayloadSize(uint size) {
        if (msg.data.length < size + 4) {
            revert();
        }
        _;
    }

    function transfer(address _to, uint tokens) onlyPayloadSize(2 * 32) public returns (bool success) {
        require(_to != address(0));
        require(frozen[_to] != true);
        require(frozen[msg.sender] != true);
        require(tokens <= balances[msg.sender]);

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

    function approve(address spender, uint tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }

    function transferFrom(address _from, address _to, uint tokens) onlyPayloadSize(2 * 32) public returns (bool success) {
        require(_to != address(0));
        require(frozen[_to] != true);
        require(frozen[_from] != true);
        require(frozen[msg.sender] != true);
        require(tokens <= balances[_from]);
        require(tokens <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(tokens);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(tokens);
        balances[_to] = balances[_to].add(tokens);
        emit Transfer(_from, _to, tokens);
        return true;
    }

    function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
        return allowed[tokenOwner][spender];
    }

    function increaseApproval(address _spender, uint _addedValue) public 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, 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);
      }
      emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
      return true;
    }

    function () external payable {
        revert();
    }

    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }

    function freeze(address target) public onlyOwner returns (bool success) {
        frozen[target] = true;
        emit Freeze(target);
        return true;
    }

    function unfreeze(address target) public onlyOwner returns (bool success) {
        frozen[target] = false;
        emit Unfreeze(target);
        return true;
    }

    function burn(uint tokens) public returns (bool success) {
        require(frozen[msg.sender] != true);
        require(tokens <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(tokens);
        _totalSupply = _totalSupply.sub(tokens);
        emit Burn(msg.sender, tokens);
        return true;
    }
}

{
  "compilationTarget": {
    "CubiatStableToken.sol": "CubiatStableToken"
  },
  "evmVersion": "petersburg",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}