Norme bip39 http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Although it takes advantage of BIP32 approach it is possible to even now import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 version which some wallet use for the generation of seeds. Due to the fact adding a passphrase towards your seed words results https://bookmarkilo.com/story19882638/bip39-generator-python-rumored-buzz-on-bip39-generator-https-t-me-bip39-chat