The good thing is, in 2012 the developer Pieter Wuille created the BIP32 specification at The bottom on the hierarchical deterministic wallets. Collectively with it, Pieter produced a mathematical function to create a learn essential from which to derive all other keys within a deterministic way. BIP39 and 44, on https://bookmarkmargin.com/story18990889/not-known-factual-statements-about-bip39-explained