Bip39 Word List Numbers. Is passphrase similar to PIN? No, a passphrase is not really similar to a PIN. A passphrase, during the context of Bitcoin wallets, is an extra layer of protection in your wallet that actually works together with your seed phrase to encrypt and shield your wallet. https://socialbraintech.com/story4109310/bip39-wallets-https-linktr-ee-bip39-the-fact-about-bip39-words-that-no-one-is-suggesting