Bip39 explained https://www.storeboard.com/myrtierisaliti Though it works by using BIP32 technique you'll be able to continue to import BIP39 seeds into Electrum wallet. Also apart from BIp32 There's BIP44 Model which some wallet use with the generation of seeds. Simply how much safety does a passphrase include? A BIP39 passphrase considerably https://bookmarkstown.com/story20102680/bip39-j-90-4g-c-not-known-details-about-bip39-word-list-txt-https-x-com-tundra838554