From Bip39 Import Mnemonic 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 with the technology of seeds. You are able to see the entire source code in https://bookmarksfocus.com/story4081659/trust-wallet-seed-phrase-generator-a-review-of-seed-phrase-generator