Bip39 ozon https://felixkkjt585.theglensecret.com/bip39-word-checklist-generator-crafting-your-own-special-seed-phrase Though it uses BIP32 approach you could continue to import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There's BIP44 version which some wallet use to the generation of seeds. The amount of protection does a passphrase increase? A BIP39 passphrase drast... https://bookmarkinginfo.com/story20572446/bip39-cli-an-unbiased-view-of-bip39-2048-words-https-x-com-tundra838554