Bip39. The passphrase is not picked within the predefined list of 2048 words – it may be any word or phrase you select. BIP39 can be a design and style implementation that lays out how copyright wallets create the set of words (or "mnemonic codes") which make up a mnemonic https://bookmarkassist.com/story18764505/bip39-https-linktr-ee-bip39-top-guidelines-of-bip39-passphrase