Bip39 Derivation Although it makes use of BIP32 approach it is possible to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 version which some wallet use to the era of seeds. You are able to see the complete resource code in standalone, offline html https://www.youtube.com/channel/UCUpxfyTJ0fb78SQ55hU6OCw