Bip39 passphrase wallet https://www.tumblr.com/generalllamacolor/787594721599078400/can-you-depend-on-online-bip39-generators-a A BIP39 seed phrase developed with appropriate randomness can not be guessed through brute force, since you'll find simply too several permutations. BIP32 and BIP44 work jointly to add flexibility, privateness, and interoperability to High definition Wallets.... https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide