Bip39 Meaning While it takes advantage of BIP32 method you'll be able to even now import BIP39 seeds into Electrum wallet. Also aside from BIp32 There exists BIP44 Model which some wallet use for that era of seeds. You'll be able to see the entire source code in standalone, offline https://toplistar.com/story20372105/bip39-release-date-the-basic-principles-of-seed-phrase-generator