Bip39 key https://files.fm/u/2eemhhak2q#design Though it works by using BIP32 technique you are able to however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There is certainly BIP44 Variation which some wallet use for your technology of seeds. The amount of security does a passphrase add? A BIP39 https://doctorbookmark.com/story19901285/bip39-mnemonic-github-5-tips-about-bip39-checksum-you-can-use-today-https-cutt-ly-uryc5rw7