Bip39 format example https://telegra.ph/Producing-Custom-Bitcoin-Addresses-A-Take-A-Look-At-BIP39-Strategies-06-28 While it employs BIP32 process you'll be able to nevertheless import BIP39 seeds into Electrum wallet. Also aside from BIp32 There's BIP44 version which some wallet use with the generation of seeds. Exactly how much protection does a passphrase increase? A BIP39 passphras... https://bookmarkfly.com/story20597557/bip39-wallet-app-the-greatest-guide-to-bip39-https-t-me-bip39-chat