I doubt criminals to be the first people to have their hands on quantum computing.

First will be scientists. They will let the world know that hash was broken.

Bitcoin price will go down a bit.

We will upgrade the network and everything will be fine.

That’s my guess.

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It’s likely to be classified first. Likely that it could be compromised and nobody besides a select group will know.

It will be SIGINT. They will tell no one for as long as they can. They may already have a back door. That is their job.