Update
Kraken futures limit orders can fill after cancellation during Maker Protection hold
A Kraken futures limit order canceled during the Maker Protection hold can still fill at its original release time. The held placement becomes immediate‑or‑cancel, so any unfilled remainder cannot remain on the order book. Coverage is contract‑specific and spot trading is unaffected. Automated traders must reconcile the order’s execution response as well as the successful cancellation acknowledgment.