code: func NewRegisterBlockEvent(filter fab.BlockFilter, eventch chan<- *fab.BlockEvent, respch chan<- fab.Registration, errCh chan<- error) *RegisterBlockEvent {
  	return &RegisterBlockEvent{
  		Reg:           &BlockReg{Filter: filter, Eventch: eventch},
  		RegisterEvent: NewRegisterEvent(respch, errCh),
  	}
  }
docs: // NewRegisterBlockEvent creates a new RegisterBlockEvent