Bip39 Passphrase. The passphrase is not chosen from the predefined list of 2048 words – it can be any word or phrase you decide on. Entropy is a complicated characteristic. Your mnemonic might be insecure if this aspect is made use of improperly. Examine additional BIP-32 hierarchical deterministic wallet. BIP-39 https://whitebookmarks.com/story19664348/bip39-wallets-https-linktr-ee-bip39-not-known-details-about-bip39-wallets