Bip39 Seed. The passphrase is not really picked in the predefined list of 2048 words – it may be any word or phrase you choose. BIP39 specifies a list of 2048 words from which the mnemonic phrase is preferred. Each word signifies a number in a very binary sequence, as https://mixbookmark.com/story5212357/bip39-word-list-pdf-https-linktr-ee-bip39-not-known-details-about-bip39-list