Swan Treasury lost about $625,000 after attackers exploited a compromised off chain signer key on BNB Chain.The attacker bought about 687,000 STY at a 100 times discount using forged signatures and a PancakeSwap flash loan.Forged claim and transfer signatures allowed the attacker to sell the tokens into the STY USDT pool for profit.Security analysis found the transactions were signed with the protocol’s compromised signer key rather than exploiting a flaw in signature verification.