Coincheck says no hack behind withdrawal freeze, blames outside service outage

Coincheck suspended all cryptocurrency deposits in the early hours of Thursday, November 5, 2026, after an external on-chain analysis service it uses to screen transactions stopped working, the exchange said. The disruption was not caused by unauthorized access or a breach affecting customer assets, Coincheck said. Processing of deposits and withdrawal requests began lagging around 00:04 Japan time, and Coincheck canceled new and pending withdrawal requests; canceled funds will be returned to account balances, while incoming transfers remain delayed. Coincheck did not name the provider. Chainalysis, which offers a Know Your Transaction screening product, took that product offline on November 4 after flagging abnormal activity, but neither company has publicly linked the two events.