Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase is just not the same as a PIN. A passphrase, inside the context of Bitcoin wallets, is an extra layer of stability to your wallet that actually works along with your seed phrase to encrypt and safeguard your wallet. https://bookmarkspring.com/story13515432/bip39-wallet-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean