Bip 39 Passphrase While it takes advantage of BIP32 method you'll be able to still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There may be BIP44 Variation which some wallet use to the era of seeds. Here are five approaches to produce a seed phrase, having an https://travialist.com/story8707144/seed-phrase-generator-mnemonic-bip39-word-list-secrets