Bip39 release date https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure Although it makes use of BIP32 approach you can still import BIP39 seeds into Electrum wallet. Also besides BIp32 There's BIP44 version which some wallet use for that technology of seeds. Such as, for those who initially build your wallet and produced seed employing Led... https://yxzbookmarks.com/story20800513/bip39-generator-bip39-github-an-overview-https-cutt-ly-uryc5rw7