Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase just isn't similar to a PIN. A passphrase, in the context of Bitcoin wallets, is an extra layer of safety to the wallet that actually works together with your seed phrase to encrypt and protect your wallet. A PIN, https://wisesocialsmedia.com/story4953866/bip39-wallets-https-linktr-ee-bip39-an-unbiased-view-of-bip-39