code: func (d *DeliverClient) GetNewestBlock() (*cb.Block, error) {
  	err := d.seekNewest()
  	if err != nil {
  		return nil, errors.WithMessage(err, "error getting newest block")
  	}
  
  	return d.readBlock()
  }
docs: // GetNewestBlock gets the newest block from a peer/orderer's deliver service