Bip39 Seed Phrase. The passphrase just isn't selected in the predefined list of 2048 words – it can be any word or phrase you choose. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. Every word signifies a range inside of a binary sequence, https://echobookmarks.com/story18726390/ian-coleman-bip39-https-linktr-ee-bip39-not-known-details-about-bip39-list