Bip39 Passphrase. The passphrase will not be picked with the predefined list of 2048 words – it could be any word or phrase you choose. By making use of a passphrase, you add an extra layer of protection towards your wallet, defending your cash although your seed phrase is compromised. https://letsbookmarkit.com/story18625618/bip-39-https-linktr-ee-bip39-a-review-of-bip39-word-list-pdf