Bip39 Word List Numbers. Is passphrase similar to PIN? No, a passphrase is not really similar to a PIN. A passphrase, within the context of Bitcoin wallets, is an additional layer of security on your wallet that actually works along with your seed phrase to encrypt and defend your wallet. https://sites2000.com/story9302052/ian-coleman-bip39-https-linktr-ee-bip39-a-review-of-bip39-word-list-pdf