Ya, karena seperti yang kita tahu Descriptor wallet tidak mendukung adanya pengeksposan private key

Jika dibilang aman atau tidaknya (untuk tujuan import ke wallet lain atau proses recovery dari single private key), saya rasa balik lagi ke persepsi masing-masing. Namun jika mengingat Legacy wallet adalah sebuah bentuk wallet yang dipilih dan diciptakan oleh Satoshi, saya kira jika kita melakukan import atau proses recovery menggunakan single private key sejatinya adalah bentuk implementasi Legacy wallet.

Tidak ada yang tahu juga, seandainya Satoshi masih aktif di pengembangan Bitcoin Client, apakah dia juga akan meninggalkan Legacy wallet dan menggantinya dengan konsep wallet yang baru.

The Problem with Legacy Wallets

Legacy Wallets were initially designed by Satoshi himself. As this was when Bitcoin was first created, the understanding of what Bitcoin could do and how Bitcoin can be used was not as well understood as it is today. As such, the wallet was built around the private keys and everything based around private keys even though Bitcoin has a scripting language that supports a lot more than just private keys. So Legacy Wallets primarily contain private keys, and from these private keys, addresses are made.

Even with just private keys, the Legacy Wallet was designed long before BIP 32 Hierarchical Deterministic Wallets were invented. It was designed to use a random number generator to create private keys, not deriving them from a seed. While the Legacy Wallet does support BIP 32 now, it is still not up to the level of support that other wallets have. This support is done by replacing the RNG with BIP 32 derivation. But there is no support for watching extended public keys (xpubs) and pubkeys cannot be derived, nor are pubkeys stored by the wallet.

Since Bitcoin was first created, we have learned that there are many more things that output scripts can do than just single keys. The scripting system in Bitcoin is powerful, but Bitcoin Core’s wallet cannot make use of it because more than just keys are involved in scripts. Even just the introduction of P2SH introduced some issues for the Bitcoin Core wallet, and supporting the watching of scripts is largely bolted on and not integrated very well. Watch-only in Legacy Wallets does not quite work as one would expect, and having a mix of watch-only and non-watch-only things in a Legacy Wallet only makes things more confusing. Ultimately, extending the Legacy Wallet has primarily been hacking in new features rather than having a truly well designed wallet that can make the full use of Bitcoin.

Karena seperti yang kita tahu dalam kedepannya Bitcoin core kemungkinan besar tidak akan lagi bisa digunakan untuk membuat dan mengakses sebuah Legacy wallet

Ya, saya juga sempat membaca note tersebut, dan sempat terbesit pertanyaan: bagaimana nanti dengan fitur sign message dari address Bitcoin, sementara di Bitcoin Core sudah jelas tidak bisa sign message menggunakan SegWit address*, tidak sebagaimana di Electrum.