Bip39 Passphrase. The passphrase will not be picked in the predefined list of 2048 words – it can be any word or phrase you choose. Entropy is a complicated function. Your mnemonic can be insecure if this aspect is utilized incorrectly. Go through far more BIP-32 hierarchical deterministic wallet. BIP-39 https://top100bookmark.com/story18959689/bip39-wallet-https-linktr-ee-bip39-bip39-generator-an-overview