There have also been concerns about the lack of regulation governing bitcoins.
U.S. lawmakers on a Senate hearing earlier this month heard evidence on whether bitcoin should be considered a "legal means of exchange". And in U.S. Senate hearing last week, Federal Reserve chief Ben Bernanke used a quote from a previous committee to highlight "areas of long-term promise" for virtual currencies such as bitcoin.
(Read more: How hackers are targeting bitcoins)
Richard Branson meanwhile became the latest personality to embrace the virtual currency after announcing on Friday that his space flight service, Virgin Galactic, will start accepting bitcoins as payment.
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