Bip39 offline https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide Even though it takes advantage of BIP32 process you may however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There may be BIP44 Model which some wallet use to the technology of seeds. The BIP39 word list is often a set of two,048 very carefully https://500px.com/p/alexzhiglatyxrnxb