build/transaction.go
func (b *TransactionBuilder) HashHex() (string, error) {
	hash, err := b.Hash()
	if err != nil {
		return "", err
	}

	return hex.EncodeToString(hash[:]), nil
}
func (b *TransactionBuilder) HashHex() (string, error) {
	hash, err := b.Hash()
	if err != nil {
		return "", err
	}

	return hex.EncodeToString(hash[:]), nil
}
// HashHex returns the hex-encoded hash of this builder's transaction