Bip39 Seed Generator. Is passphrase similar to PIN? No, a passphrase is just not similar to a PIN. A passphrase, from the context of Bitcoin wallets, is an extra layer of stability to the wallet that actually works alongside your seed phrase to encrypt and defend your wallet. A PIN, https://getidealist.com/story20527512/bip-39-https-linktr-ee-bip39-a-review-of-bip39-generator