THORChain Details Refund Error That Left a Vault 10 Ether (ETH) Short

THORChain traced a 10 Ether (ETH) vault shortfall to duplicate refunds after an Ethereum reorganization, while swaps remained disabled on 10 networks Monday as developers worked on fixes. At 7:34 a.m. ET (11:34 UTC) Saturday, Oct. 31, a one-block Ethereum reorganization removed a block containing a deposit THORChain had already logged. The swap failed to meet the sender’s price limit. THORChain made two refunds: one for the deposit it thought it held and another for the actual deposit. The shortfall triggered THORChain’s solvency check, which automatically stopped Ethereum swaps. Node operators halted outgoing ETH transactions about two minutes later, and a vote by three nodes paused swaps across all chains. The sender has since returned the 10 ETH, closing the shortfall.

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