interface HXB {
    function mintHXB (uint256 value, address receiver)
        external
    returns (bool);
    
    function mintRatio() external pure returns (uint256);//hxb
    function mintBlock() external pure returns (bool);//hxy/hxb
   // uint256 mintRatio;
   // bool mintBlock;
}
function mintBlock() external pure returns (bool);
//hxb