“Alex Wilhelm is a bitcoin miner, one of thousands who use computers to solve complex math problems and get their hands on the digital currency. The expatriate living in Tokyo has 30 remote-controlled servers mining virtual gold in an old brick building in the Austrian countryside. His father is donating the electricity, which comes from a water-driven turbine that survived a World War II bombing raid and once powered the entire village of Tattendorf, where Wilhelm grew up. While the operation is modest as mining farms go, it illustrates a basic point: the race to uncover cyber cash has become so energy intensive that power bills now make it mostly unprofitable.”
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