/// <reference types="node" />
export interface SignMessageParamsNEP {
    message: string;
    recipient: string;
    nonce: Buffer;
    callbackUrl?: string;
    state?: string;
}
export interface SignMessageParams {
    chainId: string;
    messageParams: SignMessageParamsNEP & {
        accountId?: string;
    };
}
export declare class MessagePayload {
    tag: number;
    message: string;
    nonce: Buffer;
    recipient: string;
    callbackUrl?: string;
    constructor(data: SignMessageParamsNEP);
}