The good news is, in 2012 the developer Pieter Wuille created the BIP32 specification at The bottom of the hierarchical deterministic wallets. Together with it, Pieter designed a mathematical perform to produce a master critical from which to derive all other keys in a deterministic way. This information describes BIP39, https://listbell.com/story8529435/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool