Overview
- The Anti-Corruption Data Collective published a report on Aug. 20, 2026 that identified 556 so-called “Orca” wallets and singled out 152 focused on military markets that together won about $8 million with a 97.2% long‑shot success rate.
- ACDC found Orca accounts often placed large, well-timed long‑shot bets within an hour of creating wallets and then disappeared, a pattern the group says matches prior suspected insider cases but does not by itself prove wrongdoing.
- The study documents examples where an early Orca bet was followed minutes or hours later by large automated bot wagers and high-value ‘Whale’ trades that amplified the signal before public disclosure of military actions.
- Polymarket says it has referred dozens of flagged accounts to the Justice Department, hired former law enforcement staff, built proprietary on‑chain surveillance tools, and introduced enhanced market integrity rules.
- Legal and policy pressure is rising as the Van Dyke criminal prosecution and CFTC interest test how existing fraud and commodities laws apply to prediction markets while researchers urge identity checks, withheld payouts, or bans for the riskiest contracts.