Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase is just not the same as a PIN. A passphrase, during the context of Bitcoin wallets, is an extra layer of protection in your wallet that actually works along with your seed phrase to encrypt and safeguard your wallet. https://bookmarkspecial.com/story19669986/bip39-mnemonic-https-linktr-ee-bip39-not-known-factual-statements-about-ian-coleman-bip39