If you drive outside the city of Campton, population less than 400, the low industrial noise of crypto mining rises from the trees. Step closer, and the source comes into view: squat metal buildings that look like shipping containers arrayed in a semicircle, thrumming with fans and processors. There’s chain-link fencing, security cameras, and two guards sitting in pickup trucks just beyond the wire.
There are steel shipping containers like this all over these hills, right where the old coal mines once stood. And inside, specialized computers race to solve complex math problems—competing to verify bitcoin transactions and earn slivers of digital currency as a reward.
For a brief moment, in
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