Bip39 Seed. Is passphrase similar to PIN? No, a passphrase will not be similar to a PIN. A passphrase, during the context of Bitcoin wallets, is an extra layer of safety towards your wallet that works along with your seed phrase to encrypt and secure your wallet. A PIN, On https://webnowmedia.com/story4158850/bip39-mnemonic-https-linktr-ee-bip39-an-unbiased-view-of-bip-39