National authorities across the globe, and particularly in Asia, have attempted to put the brakes on a global boom in the trading of Bitcoin and other cryptocurrencies - a form of digital money created and maintained by its users.

    But Joachim Wuermeling, a member of the board of Germany’s Bundesbank, said national rules may struggle to contain a global phenomenon.

    “Effective regulation of virtual currencies would therefore only be achievable through the greatest possible international cooperation, because the regulatory power of nation states is obviously limited,” Wuermeling told an event in Frankfurt.




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