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I didn't hear about that. Could it be that you're confusing the hive-engine, which is a second layer, with HIVE?

there are 2 distinct nodes HE nodes for Hive engines, and Hive nodes. Both of them were affected. We had someone putting something like 300.000 buy/sell orders using a bot, slowing down to a halt basically everything.

It was scary to see that one bad actor could stop HE from working. I believe that the new witness software is more resilient now but I agree that such things shouldn't happen at all...

Not enough node or not enough processing power. Either way is not good enough. Imagine a state supported attack on Hive, there is no chance to stop it.