Bip39 Word List Numbers. Is passphrase similar to PIN? No, a passphrase is not really similar to a PIN. A passphrase, from the context of Bitcoin wallets, is an extra layer of stability to your wallet that actually works together with your seed phrase to encrypt and protect your wallet. https://bouchesocial.com/story20990339/bip39-passphrase-https-linktr-ee-bip39-getting-my-bip39-wallets-to-work