Bip39 Mnemonic. 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 security towards your wallet that actually works along with your seed phrase to encrypt and safeguard your wallet. A PIN, Alternatively, https://reallivesocial.com/story4347448/bip39-mnemonic-https-linktr-ee-bip39-about-ian-coleman-bip39