Bip39 Npm. First of all it is best to store it Independently from the seed. Owning your seed and your passphrase in the same area defeats the purpose of using a passphrase to begin with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. https://bookmarkfriend.com/story19074433/bip39-https-linktr-ee-bip39-getting-my-bip39-wallets-to-work