Bip39 Seed Phrase. It is really easy — if you don't concern yourself with copyright inheritance, no one else will — not your application or hardware wallet distributors, not your exchanges, and never your wealth professionals. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. https://socialtechnet.com/story4127036/bip-39-https-linktr-ee-bip39-top-guidelines-of-bip39-passphrase