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UMA is an optimistic oracle (OO) that can verify any statement proposed on the blockchain. It tells smart contracts “things about the world” so contracts and markets asking for that data can be settled. The OO functions as a decentralized truth machine that includes human reasoning. It is flexible enough to handle ambiguity and expands what can be built in Web3. UMA’s Optimistic Oracle allows smart contracts to securely request and receive any type of arbitrary data, instead of just price data.