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BTC $78,048.57 +0.76%
ETH $2,346.46 +1.53%
BNB $631.78 +0.29%
XRP $1.42 -1.03%
SOL $85.82 -0.62%
TRX $0.3239 -0.07%
DOGE $0.0977 -0.55%
ADA $0.2497 -0.50%
BCH $451.82 -0.47%
LINK $9.32 -0.77%
HYPE $41.27 -0.02%
AAVE $93.95 -0.59%
SUI $0.9454 +0.33%
XLM $0.1703 -1.80%
ZEC $355.96 -0.66%

hacked

GoPlus: Polymarket Hacked, Flaws in Off-Chain and On-Chain Transaction Result Synchronization Mechanism

According to disclosures from the GoPlus Chinese community, the prediction market platform Polymarket was hacked due to a design flaw in the synchronization mechanism between off-chain and on-chain trading results in its order system.The attacker manipulated the nonce, causing on-chain matched trades to be canceled or invalidated before execution, while off-chain records remained valid, leading to API false reports that affected trading behaviors of bots like Negrisk, resulting in user losses. The analysis of the attack process is as follows:The attacker submitted/matched large reverse trades with the market-making bot on the Polymarket off-chain orderbook.The attacker constructed transactions with forged/repeated nonces or utilized on-chain nonce competition, causing the on-chain transactions to inevitably revert.The Polymarket API returned "transaction successful" to the bot before on-chain confirmation, leading the bot to believe that the position had been hedged, while the actual on-chain state had not changed.The attacker then executed real on-chain trades to take advantage of the direction exposed by the bot, thus profiting "risk-free."Since the revert occurred at the chain level, Polymarket fees would not explode, making the attack cost controllable and executable continuously.GoPlus recommends that users pause automated trading tools, verify on-chain trading statuses, enhance wallet security, and closely monitor official announcements from Polymarket.
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