The danger is past, and there are lessons to learn.

Markets occasionally dump a bucket of icy water on everyone at once, and on Oct. 10, it was the cryptocurrency sector's turn. In the late afternoon, President Donald Trump threatened to hike tariffs on China, and then a total panic exploded in crypto. For a few terrifying minutes, prices looked like trapdoors into oblivion, wiping hundreds of billions of dollars off the sector's market cap.

Flash crashes like these are obviously extremely uncomfortable for investors, but they're clarifying because they expose weak financial plumbing, miscalibrated risk-taking habits, and shaky narratives. They also give long-term investors a checklist for what to do next. Here's what you need to know, and what you need to do.

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