Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase just isn't similar to a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of protection for your wallet that actually works alongside your seed phrase to encrypt and defend your wallet. A PIN, https://onelifesocial.com/story3978992/bip-39-https-linktr-ee-bip39-not-known-details-about-bip39-wallets