Bip39 first 4 letters https://www.gamespot.com/profile/pothirpeib/ Despite the fact that it makes use of BIP32 approach it is possible to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 There is certainly BIP44 Edition which some wallet use for that generation of seeds. BIP39 solves this by using human-readable https://telegra.ph/Producing-Custom-Bitcoin-Addresses-A-Take-A-Look-At-BIP39-Strategies-06-28