Ethereum is off on another tangent named Casper, with shards, consensus-by-betting, etc, which is another hopeless and futile attempt to solve a problem that CAN NOT BE SOLVED BECAUSE OF THE INVIOLABLE CAP THEOREM!
Casper adds Game theory into the mix. You can fool lightweight nodes, but you will lose a lot of money after that. Security deposits solve a lot of problems in real world.
Proof-of-cheating (or by any other name) backed by deposits, is a game theory that leads to centralization. Think it out. It is not really that hard to show that. It has
analogous flaws as PoS.
Edit: for n00bs, note that by definition if we will use proof-of-cheating with deposits in Casper (along with consensus-by-betting) to rely on some limited number of nodes with deposits to verify the block chain for us, then those masternodes have the same economic problem that I explained in my prior post and thus the one with the most income is the winner take all, i.e. 100% centralization. There is simply no way to avoid centralization of verification. The solution is the one I have designed and explained and which Ethereum is not implementing.