code: func (c *Client) RegisterFilteredBlockEvent() (fab.Registration, <-chan *fab.FilteredBlockEvent, error) {
  	return c.eventService.RegisterFilteredBlockEvent()
  }
docs: // RegisterFilteredBlockEvent registers for filtered block events. Unregister must be called when the registration is no longer needed.
  //  Returns:
  //  the registration and a channel that is used to receive events. The channel is closed when Unregister is called.