Bip39 Mnemonic. Is passphrase similar to PIN? No, a passphrase will not be similar to a PIN. A passphrase, while in the context of Bitcoin wallets, is an additional layer of security towards your wallet that works together with your seed phrase to encrypt and protect your wallet. A PIN, https://socialicus.com/story5049600/bip-39-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained