Bip39 address https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Although it makes use of BIP32 process you could nevertheless import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 Variation which some wallet use for the generation of seeds. Some wallets can import various seed phrases and a few have only one https://zanevnex175.lowescouponn.com/practical-use-a-python-based-bip39-seed-generator-in-the-real-world