code: func ToHash(h Base64String) (common.Hash, error) {
  	hashBytes, err := ToBytes(h)
  	if err != nil {
  		err = fmt.Errorf("unable to parse ethereum hash: %s", err)
  	}
  	return common.BytesToHash(hashBytes), err
  }
docs: // ToHash returns the ethereum's hash represented by the base64 string s.