interface TicketInterface {

    //One address needs to have enough EPK to unlock accounts. If one account has been unlocked before, the method will not take effect.
    function PaymentTicket() external;

    //Check if the one address has paid EPK to unlock the account.
    function HasTicket( address ownerAddr ) external view returns (bool);
}
function HasTicket( address ownerAddr ) external view returns (bool);

//Check if the one address has paid EPK to unlock the account.