code: func ValidateAttachedTransactionTrytes(trytes ...Trytes) Validatable {
  	return func() error {
  		for i := range trytes {
  			if !IsAttachedTrytes(trytes[i]) {
  				return errors.Wrapf(ErrInvalidAttachedTrytes, "at index %d", i)
  			}
  		}
  		return nil
  	}
  }
docs: // ValidateAttachedTransactionTrytes validates the given attached transaction trytes.