UMA

UMA is an optimistic oracle (OO) that enables the recording of any verifiable truth onto a blockchain. The OO has been described as a "human-powered truth machine" due to its flexibility in handling ambiguity, expanding the design space for web3 applications. UMA's optimistic oracle design is a departure from traditional price-feed oracles. Instead of instantly finalizing data, UMA's OO uses a "true unless disputed" pattern, where an answer is accepted as true if it is not disputed during a verification period. This allows for human input and dispute resolution, which is crucial for web3 projects that require arbitrary data that cannot always be reduced to code. The UMA token provides economic guarantees to protocols using the OO, and token holders play a vital role as voters in resolving disputes or queries. Active and accurate voters earn a yield for their participation. UMA's smart contracts have been audited extensively, and the token can be purchased on major centralized and decentralized exchanges.