Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase is not really the same as a PIN. A passphrase, while in the context of Bitcoin wallets, is an additional layer of stability on your wallet that actually works alongside your seed phrase to encrypt and protect your wallet. https://fatallisto.com/story8512423/bip39-wallets-https-linktr-ee-bip39-top-guidelines-of-bip39-words