Bip39 Word List Numbers. Is passphrase similar to PIN? No, a passphrase is just not similar to a PIN. A passphrase, during the context of Bitcoin wallets, is an additional layer of stability to your wallet that actually works along with your seed phrase to encrypt and defend your wallet. https://checkbookmarks.com/story4569163/bip39-wallets-https-linktr-ee-bip39-helping-the-others-realize-the-advantages-of-bip39