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Link: https://www.rt.com/russia/529953-metro-system-electricity-cryptocurrency/
The chief engineer of a Russian Metro system has handed in his resignation after being caught using the subway’s electricity grid substation to mine for bitcoin, consuming thousands of dollars of energy at the company’s expense. Cryptocurrency mining uses electricity and high-powered computers to solve computational math problems. The solutions are so complex that they are impossible to be solved by hand and would even be difficult for regular computers to successfully complete.