How to protect private blockchain with public blockchain?

Question

Private blockchain has the risk of 51% attack, while public blockchain is pretty safe. So can we protect private chain with public chain? I got an idea, that we can save block height and block hash, every 100 block. We save 1,101,201... block height and hash on public chain, and we verify it. But it still has risk, before 101 block is protected, 2-99 blocks still have risk. Is there a better way to solve it?

Answer 1

Hi, i belive you are correct, You may either store hash of your Nth block or just store hash every day (or hour) in public chain.

You can even check out the Blockchain Certification Course by Intellipaat to have more knowledge about this topic.