Bip39 test vectors https://www.plurk.com/p/3hf2syltjx Even though it takes advantage of BIP32 method you can nevertheless import BIP39 seeds into Electrum wallet. Also other than BIp32 You can find BIP44 Variation which some wallet use to the technology of seeds. Just how much protection does a passphrase include? A BIP39 passphrase https://dftsocial.com/story20978109/kaspa-bip39-new-step-by-step-map-for-bip39-github-https-cutt-ly-uryc5rw7