code: func (api *API) GetTrytes(hashes ...Hash) ([]Trytes, error) {
  	if err := Validate(
  		ValidateNonEmptyStrings(ErrInvalidTransactionHash, hashes...),
  		ValidateTransactionHashes(hashes...),
  	); err != nil {
  		return nil, err
  	}
  	cmd := &GetTrytesCommand{Hashes: hashes, Command: Command{GetTrytesCmd}}
  	rsp := &GetTrytesResponse{}
  	if err := api.provider.Send(cmd, rsp); err != nil {
  		return nil, err
  	}
  	return rsp.Trytes, nil
  }
docs: // GetTrytes fetches the transaction trytes given a list of transaction hashes.