Bip39 passphrase github https://atavi.com/share/xbwf7vz16jgof Regardless that it works by using BIP32 system it is possible to however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There exists BIP44 Edition which some wallet use with the era of seeds. How much security does a passphrase add? A BIP39 https://hyperbookmarks.com/story20525883/bip39-longest-word-the-definitive-guide-to-bip39-converter-https-x-com-tundra838554