interface btycInterface {
    //mapping(address => uint) balances;
    function balanceOf(address _addr) external view returns (uint256);
    function mintToken(address target, uint256 mintedAmount) external returns (bool);
    function transfer(address to, uint tokens) external returns (bool);
    function freezeAccount(address target, bool freeze) external returns (bool);
    function getcanuse(address tokenOwner) external view returns(uint);
}
//btyc接口类
function balanceOf(address _addr) external view returns (uint256);
//mapping(address => uint) balances;