export declare function gen(height?: number | string, { agent, signal, }?: {
    agent?: string | undefined;
    signal?: AbortSignal | undefined;
}): Promise<Response>;
type Keys = 'hash' | 'height' | 'nonce' | 'prev' | 'root';
export type Result = Readonly<Record<Keys, string>>;
export declare function btc(height?: string | number): Promise<Result>;
export declare function btc_task(task: () => Promise<Response>): Promise<Result>;
export {};