Bip39 Checksum. Is passphrase similar to PIN? No, a passphrase isn't similar to a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of security towards your wallet that actually works along with your seed phrase to encrypt and protect your wallet. A PIN, However, https://listfav.com/story20332923/bip39-wallets-https-linktr-ee-bip39-bip39-words-fundamentals-explained