Bip39 Checksum. First of all you'll want to retail outlet it Individually from your seed. Obtaining your seed plus your passphrase in the identical locale defeats the purpose of using a passphrase to start with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked out. https://socialbuzztoday.com/story4332068/bip39-passphrase-https-linktr-ee-bip39-bip39-wallet-fundamentals-explained