Bip39. At first you'll want to retailer it SEPARATELY from the seed. Obtaining your seed plus your passphrase in the exact same site defeats the objective of getting a passphrase in the first place. BIP44 defines a selected essential derivation path structure which allows for taking care of numerous accounts https://thesocialcircles.com/story5241039/bip-39-https-linktr-ee-bip39-bip39-generator-an-overview