Bip39 Seed Generator. Is passphrase similar to PIN? No, a passphrase is just not similar to a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of security on your wallet that actually works along with your seed phrase to encrypt and safeguard your wallet. https://reallivesocial.com/story4183887/bip39-mnemonic-https-linktr-ee-bip39-5-essential-elements-for-bip39-word-list