# UMA > A decentralized truth machine UMA is a decentralized oracle protocol that records any verifiable truth or data onchain using an optimistic assertion and dispute resolution system. Developers integrate UMA's Optimistic Oracle into prediction markets, insurance protocols, cross-chain bridges, and DAO governance tools to access verified off-chain data. Proposed answers become final unless disputed within a challenge period, with disputes settled by UMA token holder voting. Token holders stake UMA to participate, earning rewards for correct votes and facing penalties for missed or incorrect ones. - Type: Protocol - Sector: Infrastructure - Status: Active - Profile: https://thegrid.id/profiles/uma ## Products - [UMA Optimistic Oracle](https://thegrid.id/profiles/uma): UMA is a decentralized oracle and dispute arbitration protocol for recording verified data on blockchain networks. Asserters submit bond-backed data claims; if unchallenged within a configurable liveness period, the claim is accepted as true. Disputed claims are escalated to the Data Verification Mechanism (DVM), where UMA token holders vote on the correct outcome through a 48–96 hour commit-reveal process. Two active versions are available: OOv2, used for prediction markets, insurance, and sports betting applications, and OOv3, used for crosschain infrastructure, data assertion, and content moderation. Token holders stake UMA in the DVM to participate in dispute voting and earn protocol rewards, with inactive or incorrect voters subject to stake slashing. The protocol is deployed across multiple EVM-compatible networks including Ethereum, Polygon, Optimism, Arbitrum, Base, and Blast. (Oracle, Live, Main Product) - [oSnap](https://thegrid.id/profiles/uma): oSnap is a governance automation tool that connects Snapshot off-chain votes with on-chain transaction execution using UMA's Optimistic Oracle. After a Snapshot governance proposal concludes, its transaction payload is submitted as a bonded assertion to UMA's OOv3. If undisputed within the liveness period, the transactions execute on-chain automatically. If challenged, the DVM resolves the dispute through UMA token holder voting. (DAO Management Platform, Inactive/Support Ended) ## Assets - [UMA (UMA)](https://thegrid.id/profiles/uma): UMA is the governance and staking token of the UMA Protocol. It is used for staking in the DVM, voting on protocol upgrades and dispute resolutions, and earning rewards distributed pro-rata to correct voters. The security model requires the cost of acquiring 65% of the token supply to exceed oracle corruption profits, with staked balances subject to slashing of 0.1% per incorrect or missed vote. (Governance) ## Links - [Main](https://uma.xyz) - [Documentation](https://docs.uma.xyz) - [Blog](https://blog.uma.xyz) - [Terms of Service](https://uma.xyz/terms-of-service) - [Forum](https://discourse.uma.xyz) - [Governance](https://vote.uma.xyz) - [Twitter / X](https://twitter.com/UMAprotocol) - [Discord](https://discord.com/invite/jsb9XQJ) - [Medium](https://medium.com/uma-project) - [GitHub](https://github.com/UMAprotocol) - [YouTube](https://www.youtube.com/channel/UC-3qS7FXxCd7gBMLttmTirw) ## Legal This data is provided under two licensing models. Model 1 - open data. The open data core is licensed under the Open Database License (ODbL) — a copyleft/share-alike license allowing free use, modification, and sharing for any purpose. Attribution is required: include "Powered by The Grid" linking to https://thegrid.id wherever the data is used. Derivative databases must be shared under ODbL terms. Trademarks, logos, and brand names (marked "Special TPIP") are not covered by the ODbL. 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