Bip39 Checksum. Is passphrase similar to PIN? No, a passphrase is just not the same as a PIN. A passphrase, from the context of Bitcoin wallets, is an extra layer of protection for your wallet that actually works alongside your seed phrase to encrypt and guard your wallet. A PIN, https://getsocialnetwork.com/story4213276/bip39-list-https-linktr-ee-bip39-top-guidelines-of-bip39-mnemonic