code: func (m *wsNotificationManager) UnregisterSpentRequest(wsc *wsClient, op *wire.OutPoint) {
  	m.queueNotification <- &notificationUnregisterSpent{
  		wsc: wsc,
  		op:  op,
  	}
  }
docs: // UnregisterSpentRequest removes a request from the passed websocket client
  // to be notified when the passed outpoint is confirmed spent (contained in a
  // block connected to the main chain).