code: func TrytesToBytes(trytes Trytes) ([]byte, error) {
  	trits, err := TrytesToTrits(trytes)
  	if err != nil {
  		return nil, err
  	}
  	return TritsToBytes(trits), nil
  }
docs: // TrytesToBytes is only defined for hashes (81 Trytes). It returns 48 bytes.