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BTC $76,954.88 -1.11%
ETH $2,289.09 -1.57%
BNB $624.77 -0.73%
XRP $1.39 -1.67%
SOL $84.16 -1.96%
TRX $0.3242 +0.19%
DOGE $0.1002 +2.08%
ADA $0.2477 -0.34%
BCH $447.91 -0.27%
LINK $9.27 -0.75%
HYPE $41.17 -3.33%
AAVE $97.58 +1.12%
SUI $0.9325 -0.30%
XLM $0.1649 -2.75%
ZEC $338.84 -3.70%

goplus

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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