export declare const toSerialisedHexString: (data: {
    url: string;
    unixTimestamp: string;
    buttonIndex: number;
    inputText: string;
    state: string;
    transactionId: string;
    address: string;
    messageId: string;
    chatId: string;
    clientProtocol: string;
    env: string;
}) => Promise<string>;
export declare const sign: ({ message, signingKey }: {
    message: string;
    signingKey: string;
}) => Promise<any>;