code: func (api *API) GetTips() (Hashes, error) {
  	cmd := &GetTipsCommand{Command: Command{GetTipsCmd}}
  	rsp := &GetTipsResponse{}
  	if err := api.provider.Send(cmd, rsp); err != nil {
  		return nil, err
  	}
  	return rsp.Hashes, nil
  }
docs: // GetTips returns a list of tips (transactions not referenced by other transactions) as seen by the connected node.