code: func (el *ChannelEventListener) RegConfirmedTransfers() *ChannelEventListener {
  	el.TransferConfirmed = make(chan bundle.Bundle)
  	el.ids = append(el.ids, el.em.RegisterListener(func(data interface{}) {
  		el.TransferConfirmed <- data.(bundle.Bundle)
  	}, poller.EventTransferConfirmed))
  	return el
  }
docs: // RegConfirmedTransfers registers this listener to listen for sent off confirmed transfers.