'Fight fire with fire': IMF's Lagarde calls for bitcoin crackdown

IMF chief says cryptocurrency’s own blockchain technology could be used to control itChristine Lagarde has called for a crackdown on bitcoin by using the technology behind the digital currency to “fight fire with fire”.The head of the International Monetary Fund said authorities around the world could harness the potential of cryptocurrencies to help bring them under control, warning that failure to do so would allow the unfettered development of a “potentially major new