The good thing is, in 2012 the developer Pieter Wuille produced the BIP32 specification at the base from the hierarchical deterministic wallets. Alongside one another with it, Pieter established a mathematical operate to make a learn key from which to derive all other keys in a very deterministic way. - https://kingbookmark.com/story18935387/5-essential-elements-for-bip39-explained