Bip39 implementation https://pastelink.net/caobqzis Though it uses BIP32 technique you could even now import BIP39 seeds into Electrum wallet. Also besides BIp32 There's BIP44 version which some wallet use for that era of seeds. Thanks to the cryptographic style and design of BIP-39, a weak passphrase would not lessen the protection https://mysocialguides.com/story5917823/bip39-seed-phrase-not-known-details-about-bip39-generator-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw