interface IGraSwapBlackList {
    // event OwnerChanged(address);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event AddedBlackLists(address[]);
    event RemovedBlackLists(address[]);

    function owner()external view returns (address);
    // function newOwner()external view returns (address);
    function isBlackListed(address)external view returns (bool);

    // function changeOwner(address ownerToSet) external;
    // function updateOwner() external;
    function transferOwnership(address newOwner) external;
    function addBlackLists(address[] calldata  accounts)external;
    function removeBlackLists(address[] calldata  accounts)external;
}
function isBlackListed(address)external view returns (bool);
// function newOwner()external view returns (address);