UMA Optimistic Oracle Settlement Guide: Avoiding US Eastern Time (ET) Cutoff Traps & Checking Official Sources
Why does a market sometimes stay open after headlines break? Learn how to audit the UMA Optimistic Oracle resolution rules, convert US Eastern Time (ET) deadlines, and verify the exact primary source before risking capital.
1. Trap #1: US Eastern Time (ET) Deadlines vs. Your Local Timezone
Over 95% of Polymarket contracts specify their cutoff timestamp in US Eastern Time (ET / New York Time). Always convert the exact 11:59 PM ET cutoff into your local timezone before trading time-sensitive macro, Fed, or geopolitical contracts.
2. Trap #2: Official Primary Resolution Source vs. Social Media Rumors
Every contract names a specific Resolution Source (e.g., official Federal Reserve FOMC statement, Associated Press election call, or Binance BTC/USDT 1-minute candle). Unverified tweets or rumours do not trigger settlement unless confirmed by the designated primary source before the cutoff timestamp.
3. How the UMA Optimistic Oracle & 2-Hour Challenge Period Protect Traders
When an event concludes, a bonded proposer submits the outcome to the UMA Optimistic Oracle on Polygon. A 2-hour on-chain challenge window opens: if undisputed, the smart contract unlocks $1.00 USDC per winning share; if disputed, decentralized UMA token holders arbitrate based strictly on the written Rules.
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