Key Points Ethereum™ and Ethereum Classic were once the same blockchain. The DAO was a contract that raised a lot of money, but it had a bug that was exploited. ETH was potentially lost to The Hacker. 70% of the lost funds were recovered, but 30% remained in limbo. In response, a Hard Fork was proposed, confiscating the remaining 30% from The Hacker by stopping their application. The Hard Fork was controversial as it was not fixing a problem with the Ethereum protocol itself, and Ethereum marketed itself on "Build Unstoppable Applications". A highly questionable "coin vote" led Ethereum Foundation to support the Hard Fork, breaking their neutrality. The Hard Fork caused a chain split, resulting in Ethereum Classic. The Hard Fork was not necessary as the hacked funds could have been recovered on Ethereum Classic, but because of the fork this effort was abandoned. Having abandoned Code is Law, Ethereum™ finds itself in a philosophically questionable position when it comes to future interventions, which may be problematic. Ethereum Classic remains the longest running Smart Contract Platform, upholding the promise of "Build Unstoppable Applications".