import type { Operation } from "./index";
export declare class Signer {
    private readonly keys;
    private readonly signer;
    private constructor();
    sign(operation: Operation & {
        previous: string;
    }): Promise<string>;
    verify(operation: Operation): Promise<boolean>;
    static open(keys: {
        public?: string;
        private?: string;
    }): Signer;
}
export declare namespace Signer { }