The good news is, in 2012 the developer Pieter Wuille established the BIP32 specification at The bottom of the hierarchical deterministic wallets. Together with it, Pieter designed a mathematical operate to produce a master key from which to derive all other keys inside a deterministic way. Another benefit of BIP39 http://josuejnub341.image-perth.org/from-words-to-riches-exactly-how-to-effectively-use-bip39-passphrases-for-your-copyright-wallets