The good news is, in 2012 the developer Pieter Wuille created the BIP32 specification at the base on the hierarchical deterministic wallets. Together with it, Pieter established a mathematical functionality to create a learn essential from which to derive all other keys inside of a deterministic way. BIP39 and 44, https://wise-social.com/story4511473/considerations-to-know-about-bip39-word-list-pdf