Bip39 bitcoin core https://penzu.com/p/2ea6922b70254307 You then plan to allow BIP-39 passphrase support in your hardware wallet and stamp the passphrase(s) on the hexagonal chrome steel rod and keep the rod in a very independent geographical site for your 24-word seed backup as a way to: bip39-phrase.com can be an informational https://penzu.com/p/2ea6922b70254307