As colder weather sets in, most Americans are lighting their fireplaces and turning on their electric heaters to stay warm. But there are a handful who have opted for a new, cost-effective way to heat their homes: bitcoin mining rigs. The computing power required to mine cryptocurrency produces a lot of heat. In total, the industry generates around 100 TWh of heat annually, which is enough to heat a country the size of Finland, according to digital asset brokerage firm K33. This potential energy waste, in an industry that's already under scrutiny for the level of energy it uses, has led a number of entrepreneurs to ... (full story)