Bip39 Entropy Though it utilizes BIP32 approach you'll be able to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 Variation which some wallet use for the generation of seeds. It is possible to see the entire source code in standalone, offline html file. Alternatively https://myeasybookmarks.com/story4002761/bip39-wallet-app-bip39-word-list-secrets