Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase just isn't the same as a PIN. A passphrase, in the context of Bitcoin wallets, is an additional layer of protection to the wallet that actually works alongside your seed phrase to encrypt and guard your wallet. A PIN, https://socialistener.com/story4110241/bip39-https-linktr-ee-bip39-5-essential-elements-for-bip-39