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BTC $77,202.95 +2.95%
ETH $2,421.30 +3.31%
BNB $644.04 +1.33%
XRP $1.48 +2.01%
SOL $88.91 +0.14%
TRX $0.3280 +0.37%
DOGE $0.0995 +0.33%
ADA $0.2585 -0.13%
BCH $453.88 -0.41%
LINK $9.61 +0.49%
HYPE $44.53 +1.76%
AAVE $115.11 -0.21%
SUI $0.9998 -0.16%
XLM $0.1743 +3.06%
ZEC $329.61 -3.34%

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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