Bitcoin started the year at under USD1,000 has now reached sixteen times that, having gained 50 per cent in a week.
In part this is due to the expectation of Bitcoin futures launching on two exchanges, CME and CBOE Global Markets.
It raised the prospect of a bubble about to burst, but there is no prediction as to when, or whether, it will deflate or explode.
Approximately 16.5 million Bitcoins are now in circulation from a maximum limit of 21 million.
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