During the 2-hour delay, Disputers are incentivized to monitor contracts using UMA’s priceless financial contracts. Similar to Liquidators, Disputers can be in the form of a Dispute Bot or executed manually. Disputers reference their own off-chain price feeds to determine if a liquidation was valid or invalid. If invalid, the dispute bot will dispute the liquidation which will call UMA’s oracle known as the Data Verification Mechanism (DVM). The liquidated position will be pending until it is resolved by the DVM (48 hours later). Contracts that wish to receive a price faster than 48 hours can use UMA's Optimistic Oracle.