Bip39 Ian Coleman. The passphrase just isn't selected from the predefined list of 2048 words – it can be any word or phrase you end up picking. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. Each word represents a amount inside a binary sequence, https://bookmarkport.com/story21242079/bip39-https-linktr-ee-bip39-a-review-of-bip39-generator