Bip39 passphrase https://atavi.com/share/xbwf7vz16jgof Even though it utilizes BIP32 system you could nonetheless import BIP39 seeds into Electrum wallet. Also besides BIp32 There's BIP44 version which some wallet use for that generation of seeds. This extra complexity increases the risk of misplacing the passphrase, and thus getting rid of your copyright. https://socialistener.com/story5914612/bip39-tangem-helping-the-others-realize-the-advantages-of-bip39-recovery-tool-https-dzen-ru-bip39-phrase-com