Bip39 algorithm https://www.spreaker.com/podcast/palerioiwk--6670096 Although it uses BIP32 system you are able to even now import BIP39 seeds into Electrum wallet. Also aside from BIp32 There may be BIP44 Model which some wallet use to the era of seeds. BitBox02 - A successor towards the BitBox sequence, this hardware wallet supports https://indexedbookmarks.com/story20164195/bip39-mnemonic-to-private-key-bip39-converter-an-overview-https-linktr-ee-bip39