China's love-hate relationship with virtual currency Bitcoin

Chinese investors have limited options where to put their money, but they have been attracted to Bitcoin by the skyrocketing returns.

At the start of the year, a single Bitcoin cost $14, but they now retail for $850 each - promoting analysts to suggest short-term speculation is creating a Bitcoin bubble.

And while the Chinese authorities have not banned them, the country's banks can no longer use them for transactions.

Martin Patience reports from Beijing.