Digital currency founded DigiCash, an electronic cash company, in Amsterdam to commercialize the ideas in his research. It filed for bankruptcy in 1998. In 1999, Chaum left the company. In 1997, Coca-Cola offered buying from vending machines using mobile payments. After that PayPal emerged in 1998. Other systems followed suit, such as e-gold, but it faced issues because it was used by criminals and was closed by U.S Department of Justice in 2005. In 2008, bitcoin was introduced, which marked the start of digital currencies. Origins of digital currencies date back to the 1990s Dot-com bubble. One of the first was E-gold,
Currency War of 2009–11 the extent of hostility, but the term has been widely used by the media since Brazil's finance ministers Guido Mantega September 2010 announcement that a "currency war" had broken out. Other commentators including world statesmen such as Manmohan Singh and Guido Mantega suggested a "currency war" was indeed underway and that the leading participants are China and the US, though since 2009 many other states have been taking measures to either devalue or at least check the appreciation of their currencies. The US does not acknowledge that it is practicing competitive devaluation and its official policy is to let the