Bip39 Github. The passphrase is just not chosen through the predefined list of 2048 words – it might be any word or phrase you decide on. Using passphrases improves security and adaptability. Passphrases are a powerful alternative on the duress PIN due to practically limitless variety of possible wallets. From https://olivebookmarks.com/story19073680/bip39-mnemonic-https-linktr-ee-bip39-not-known-facts-about-bip39