code: func (c *Client) RegisterTxStatusEvent(txID string) (fab.Registration, <-chan *fab.TxStatusEvent, error) {
  	return c.eventService.RegisterTxStatusEvent(txID)
  }
docs: // RegisterTxStatusEvent registers for transaction status events. Unregister must be called when the registration is no longer needed.
  //  Parameters:
  //  txID is the transaction ID for which events are to be received
  //
  //  Returns:
  //  the registration and a channel that is used to receive events. The channel is closed when Unregister is called.