Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: One of the biggest Bitcoin currency exchanges has been taken offline after 24,000 units ($250,000; £157,800) of the virtual currency were stolen from its computer servers.

Bitcoin theft causes Bitfloor exchange to go offline