The good thing is, in 2012 the developer Pieter Wuille established the BIP32 specification at The bottom in the hierarchical deterministic wallets. Jointly with it, Pieter established a mathematical purpose to make a master critical from which to derive all other keys in the deterministic way. This information describes BIP39, https://lingeriebookmark.com/story8821068/not-known-factual-statements-about-bip39-explained