Bip39 protocol https://500px.com/p/alexzhiglatyxrnxb While it takes advantage of BIP32 system you could still import BIP39 seeds into Electrum wallet. Also aside from BIp32 there is BIP44 version which some wallet use with the era of seeds. Contrary to standard wallets derived entirely from the seed phrase, passphrase-protected wallets are hidden https://socialrator.com/story11392845/bip39-hash-new-step-by-step-map-for-bip39-github-https-dzen-ru-bip39-phrase-com