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I'm not sure we'd have a working exchange where to see them tank...

Agreed. Impact duration would probably also depend on how companies are backing up their data. Hardware can be eventually replaced. Data can not.

Imagine what it would do to cryptocurrencies!

If you have your seed someone on the other side of the planet will have an intact Blockchain.

Imagine what it would do to banking data and transfer/payment networks on the impact facing countries.