The good thing is, in 2012 the developer Pieter Wuille made the BIP32 specification at The bottom with the hierarchical deterministic wallets. Together with it, Pieter established a mathematical function to create a master critical from which to derive all other keys in the deterministic way. Mnemonic words examples are https://postheaven.net/tiablexcen/mastering-your-copyright-protection-the-essential-overview-to-bip39-passphrases