Blockchain Bip39 Despite the fact that it makes use of BIP32 method you may continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 version which some wallet use for that era of seeds. You can see the total supply code in standalone, offline html file. https://leftbookmarks.com/story18599784/bip39-js-what-does-bip39-mean