Verifier's Dilemma

[kladkogex]

Great post from Ed Felten on why verifiers are hard for non-blockchain solutions

https://medium.com/offchainlabs/the-cheater-checking-problem-why-the-verifiers-dilemma-is-harder-than-you-think-9c7156505ca1

TL;DR
If cops are paid per crime solved, there will be no police.