Postmortem: Downtime, 23 March 2023

On Thursday 23 March 2023, our trading engine was suspended from 12:55 UTC to 13:20 UTC, with orders executed in cancel only mode during this time. This suspension was triggered by our audit process detecting a possible inconsistency in the exchange state and halting the exchange as a precautionary measure. The audit process detected this and took action – as intended. Additionally, we are reviewing the behaviour of the audit process, to see if full suspension can be avoided under certain strict circumstances. For enhanced protection traders can set the trigger price of a stop order to reference Last Price, Mark Price or Index Price.