code: func NewMsgAlert(serializedPayload []byte, signature []byte) *MsgAlert {
  	return &MsgAlert{
  		SerializedPayload: serializedPayload,
  		Signature:         signature,
  		Payload:           nil,
  	}
  }
docs: // NewMsgAlert returns a new bitcoin alert message that conforms to the Message
  // interface.  See MsgAlert for details.