Bip39 Github. First and foremost you'll want to keep it SEPARATELY out of your seed. Obtaining your seed plus your passphrase in the same locale defeats the objective of possessing a passphrase to begin with. Anybody else who discovers the phrase can steal the bitcoins. It should be kept magic https://bookmarkcolumn.com/story19383568/ian-coleman-bip39-https-linktr-ee-bip39-top-guidelines-of-bip39-mnemonic