The Decentralized Autonomous Organization (DAO) was the first implementation of smart contracts on the Ethereum network. After more than $150 million was invested in this smart contract, an attacker was able to execute the code in a way that diverted around one‐third of all the DAO's assets to his own account. It would be arguably inaccurate to describe this attack as a theft, because all the depositors had accepted that their money will be controlled by the code and nothing else, and the attacker had done nothing but execute the code as it was accepted by the depositors. In the aftermath of
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