Bip39 Mnemonic. Is passphrase similar to PIN? No, a passphrase is just not the same as a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of safety for your wallet that actually works together with your seed phrase to encrypt and defend your wallet. https://social-lyft.com/story8498817/bip39-words-https-linktr-ee-bip39-a-secret-weapon-for-bip39-mnemonic