Bip39 Seed Generator. Is passphrase similar to PIN? No, a passphrase will not be similar to a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of security for your wallet that actually works together with your seed phrase to encrypt and secure your wallet. https://fatallisto.com/story8513477/bip-39-https-linktr-ee-bip39-bip39-generator-an-overview