Bip39 key https://franciscougju442.bravesites.com/entries/general/Produce-Bitcoin-Addresses-from-Seed-Every-Little-Thing-You-Required-to-Know Though it uses BIP32 approach you could nevertheless import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 version which some wallet use for the technology of seeds. This tends to tell you about vacant balances.... https://bookmarkingace.com/story20139942/bip39-mnemonic-github-5-simple-statements-about-bip39-converter-explained-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw