Bip39 explained https://list.ly/i/11078004 Even though it uses BIP32 strategy it is possible to even now import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 Variation which some wallet use for the generation of seeds. Before, bitcoin and other copyright wallets were being made and accessed https://gatherbookmarks.com/story21480353/bip39-encoding-bip39-compatible-wallet-an-overview-https-dzen-ru-bip39-phrase-com