Bip39 Standard. Is passphrase similar to PIN? No, a passphrase is just not the same as a PIN. A passphrase, in the context of Bitcoin wallets, is an extra layer of safety for your wallet that works along with your seed phrase to encrypt and shield your wallet. A PIN, https://letsbookmarkit.com/story19132928/bip39-passphrase-https-linktr-ee-bip39-about-ian-coleman-bip39