The good thing is, in 2012 the developer Pieter Wuille produced the BIP32 specification at The bottom with the hierarchical deterministic wallets. Together with it, Pieter made a mathematical function to produce a grasp crucial from which to derive all other keys in a deterministic way. In the following paragraphs https://socialtechnet.com/story4500838/the-invalid-bip39-phrase-diaries