Bip 39 Github Despite the fact that it uses BIP32 strategy you could still import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 Edition which some wallet use for that technology of seeds. Lots of people back up their wallet seed phrases or private keys on https://socialupme.com/story4249297/seed-for-the-random-number-generator-the-smart-trick-of-bip39-word-list-that-no-one-is-discussing