In June 2016, Ethereum experienced one of the largest and most controversial attacks in the history of cryptocurrencies: the hacking of "The DAO". This decentralized autonomous organization, built on the Ethereum network, had raised over 150 million dollars in ETH. An attacker exploited a vulnerability in The DAO's code, not in the Ethereum network itself, and diverted nearly 60 million dollars to a secondary account. The community was divided between those calling for a reversal of the attack with a blockchain fork and those defending the immutability of the record. Ultimately, a hard fork was executed that returned the stolen funds, creating two chains: Ethereum (ETH) and Ethereum Classic (ETC). This event profoundly marked the history of the ecosystem, demonstrating that even in decentralized technologies, human decisions and governance play a crucial role in relation to security and the fundamental values of the code.