Bip32 and bip39 https://collinmmss433.lucialpiazzale.com/from-concept-to-fact-generating-bitcoin-addresses-with-bip39 Although it makes use of BIP32 approach you are able to however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There exists BIP44 Model which some wallet use for the technology of seeds. The amount security does a passphrase include? A BIP39 passphrase ... https://digibookmarks.com/story20157899/bip39-lijst-everything-about-bip39-word-list-txt-https-t-me-bip39-chat