Bip39 Checksum. 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 additional layer of security in your wallet that actually works alongside your seed phrase to encrypt and defend your wallet. A PIN, https://socialtechnet.com/story4649487/bip39-mnemonic-https-linktr-ee-bip39-the-fact-about-bip39-words-that-no-one-is-suggesting