Bip 39 pdf https://ameblo.jp/generate-bip39brooks/entry-12913353546.html While it takes advantage of BIP32 strategy you may however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There's BIP44 version which some wallet use for the generation of seeds. It can be uncomplicated — if you don't concern yourself with copyright inheritance, https://giphy.com/channel/ebliciwsah