Bitcoins have almost tripled in value in a month. In late February one bitcoin was worth £22 ($33) but now each one sells for about £60 ($90).
Thieves who run networks of hijacked PCs are increasingly using these machines to create or "mine" the coins.
But bitcoin miners say thieves will struggle to keep up, as coin-generating technology becomes more sophisticated.Computer cash
As a virtual currency, bitcoins depend on a wide network of closely connected computers to log who holds the coins and where they are spent.
That network also shares information about who is "mining" the coins.
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