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Arbitrum bridge not hacked as $24M exploit drains Ostium DEX through oracle manipulation

What happened

A compromised oracle signer key, not a bridge vulnerability, allowed an attacker to drain roughly $24 million USDC from Ostium's liquidity vault on Arbitrum. A brief panic rippled through the Arbitrum ecosystem on July 15 when on-chain watchers flagged a suspicious $24 million.

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