Paper wallet bip39 https://josuejnub341.image-perth.org/the-future-of-copyright-security-why-bip39-issues-for-every-person While it employs BIP32 system you can however import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 version which some wallet use for the generation of seeds. This operates because BIP39 is supported by so many wallet manufacturer... https://socialtechnet.com/story5738040/bip39-mnemonic-phrase-word-list-indicators-on-bip39-ian-coleman-you-should-know-https-dzen-ru-bip39-phrase-com