Bip39 Github. Now, at the next level we use these receiving and change key bunch to deliver unique non-public keys. Use the above generate private keys and chain code and go them to the above mentioned pointed out purpose kchild = kpar + hash(Kpar, cpar, i) to make personal keys. https://socialbaskets.com/story5097576/ian-coleman-bip39-https-linktr-ee-bip39-bip39-generator-an-overview