Arbitrum RWA Trading Platform Ostium Hit After Suspected Admin Key Leak; Loss Estimated at $11.86M

ChainThink said that on July 16, GoPlus monitoring flagged a security incident involving Ostium, an RWA trading platform on Arbitrum, after a suspected leak of an administrator account's private key. Estimated losses are about $11.86 million. According to the report, the attacker opened a position via the openTrade function, manipulated prices using performUpkeep, then realized gains by calling closeTradeMarket. Because price submissions through performUpkeep require signature verification from an authorized account, the incident indicates the private key tied to that authorized signer may have been compromised. After the attack occurred last night, Ostium halted all trading. The team said it is continuing its investigation.