Bip39 seed to private key https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Though it makes use of BIP32 strategy you'll be able to still import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Model which some wallet use for that era of seeds. Mainly because adding a passphrase to your seed words produces https://bookmarkingace.com/story20595590/bip39-vs-bip84-bip39-npm-no-further-a-mystery-https-cutt-ly-uryc5rw7