When Congress meets on Thursday to discuss the environmental impact of cryptocurrency, it will highlight a growing problem for Bitcoin miners: the perception, fair or not, that they are a menace to the planet. One company that will be watching closely is Foundry, a Digital Currency Group subsidiary whose network of Bitcoin mining machines has quietly become one of the two biggest in the world, the other being China's Antpool; volume varies from week to week. Foundry is an American success story, helping its customers rake in thousands of Bitcoins and helping repatriate a growing industry to U.S. shores. But the ... (full story)