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BTC $77,034.02 -1.32%
ETH $2,280.59 -2.83%
BNB $621.94 -1.69%
XRP $1.39 -2.63%
SOL $84.26 -2.61%
TRX $0.3248 +0.40%
DOGE $0.0974 -1.56%
ADA $0.2448 -3.06%
BCH $451.84 +0.02%
LINK $9.21 -2.90%
HYPE $41.88 +1.26%
AAVE $97.22 +1.55%
SUI $0.9228 -2.51%
XLM $0.1656 -3.27%
ZEC $356.59 +0.63%

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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