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 additional layer of safety in your wallet that actually works alongside your seed phrase to encrypt and secure your wallet. A PIN, On https://social-lyft.com/story8471768/bip-39-https-linktr-ee-bip39-top-guidelines-of-bip39-passphrase