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In May 2021, the amount of funds locked globally into the decentralized finance, or DeFi, ecosystem stood at almost $89 billion. In 2020, DeFi hacks and thefts made up about half of all blockchain-related incidents despite being virtually non-existent in 2019. Smart contracts serve as DeFi’s operational backbone, enabling loans, cryptocurrency swaps, insurance, and various other services. The use of flash loans, uncollateralized loans that must be paid off in the same transaction, was a key component in many attacks that were aimed at data oracles.