THORChain node operators paused swaps involving assets on 10 networks, including Bitcoin, Ethereum, Solana and Tron.
THORChain halted swaps across multiple blockchains on Saturday after an Ethereum block reorganization exposed a refund bug, which may have inadvertently slowed the movement of funds stolen from Binance, according to Chainalysis.
According to THORChain, the incident began at 11:34 UTC on Saturday, when a one-block reorganization on Ethereum removed a 10 ETH deposit that THORChain had already credited. When the swap failed to meet its price limit, THORChain issued a refund against funds the vault had never received. The sender’s actual deposit was also refunded, resulting in an extra 10 ETH payout, which then triggered an automatic pause.&
An Ethereum block reorganization, or reorg, happens when the network replaces a recent block with a competing block. The newly discovered flaw lets THORChain refund a payment that Ethereum no longer recognizes as having happened. A malicious actor could potentially exploit that mismatch.
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