Bip39 Standard. 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, However, https://funny-lists.com/story19770235/bip39-wallets-https-linktr-ee-bip39-getting-my-ian-coleman-bip39-to-work