The anonymity of bitcoin, the blockchain-backed cryptocurrency, has made it a useful tool for some criminal outfits looking to operate in the shadows. The Italian mafia has used bitcoin to launder money for its illicit activities, for instance, and the notorious WannaCry hackers extorted over $140,000 worth of the cryptocurrency from their malware victims And now an anonymous group of hackers is demanding HBO fork over millions of dollars in bitcoin to keep them from leaking sensitive information about the hit show "Game of Thrones." The demands came in the form of a five-minute video addressed to the network's ... (full story)