import { EncryptedGroupKey, EncryptionType, MessageID, MessageRef, SignatureType, StreamMessageType } from '@streamr/protocol';
export declare const createSignaturePayload: (opts: {
    messageId: MessageID;
    content: Uint8Array;
    messageType: StreamMessageType;
    signatureType: SignatureType;
    encryptionType: EncryptionType;
    prevMsgRef?: MessageRef;
    newGroupKey?: EncryptedGroupKey;
}) => Uint8Array;
