Bip39-Standalone. The passphrase is just not picked through the predefined list of 2048 words – it could be any word or phrase you end up picking. BIP39 is a style implementation that lays out how copyright wallets produce the set of words (or "mnemonic codes") that make up a mnemonic https://7prbookmarks.com/story19490962/bip39-wallet-https-linktr-ee-bip39-an-unbiased-view-of-bip-39