Bip39 mnemonic seed phrase https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure Though it employs BIP32 strategy you could continue to import BIP39 seeds into Electrum wallet. Also apart from BIp32 there is BIP44 Variation which some wallet use with the era of seeds. Push X to abort passphrase application and continue to keep editing the pa... https://apollobookmarks.com/story20529560/bip39-wordlist-bip39-passphrase-generator-options-https-x-com-tundra838554