_formatMessage(signedMessage) {
    return {
      round: this.#round++,
      partyId: this.#partyId,
      publicKey: this.#authKey.publicKey.toString(),
      p2pMessages: signedMessage.p2pMessages,
      broadcastMessages: signedMessage.broadcastMessages,
    };
  }
@private
Format the message to be sent to the other parties
@param {Object} signedMessage
@returns