Bip39 Passphrase Optional. It is truly worth noting that a seed phrase grants use of your private keys. Whereas private keys are cumbersome to use and are available in the string of 256 alphanumeric characters, seed phrases are usually twelve or 24 words prolonged, and made up of normal words. https://cesarozjtd.wikilowdown.com/6499275/the_anatomy_of_the_bip39_phrase_entropy_words_and_phrases_and_safety