Bip39 Passphrase. Take into account the best way to securely again up and move around the passphrase if necessary: Although you can theoretically depend on your memory, you might want to consider a protected backup approach. BIP39 specifies a list of 2048 words from which the mnemonic phrase is preferred. https://baidubookmark.com/story19378978/bip-39-https-linktr-ee-bip39-bip39-words-secrets