THORChain halts 10 blockchains after Ethereum reorg triggers 10 ETH overpayment

THORChain abruptly suspended trading on ten blockchains following an incident involving an Ethereum block reorganization, which led to a 10 ETH overpayment from one of its vaults. The issue began when an Ethereum reorg at 11:34 UTC on October 31 resulted in a vault paying out 10 ETH for a deposit that never finalized on the canonical chain. During the brief one-block reorg, a user’s 10 ETH deposit appeared in a block that was later dropped. THORChain’s system observed the deposit and credited it, even though the Ethereum chain did not ultimately confirm the transaction. This discrepancy created a situation where the protocol refunded the unconfirmed deposit, issuing 10 ETH it had not actually received.

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