Mining Bitcoin efficiently requires a powerful computer, and few home computers are more powerful than gaming rigs. Enterprising hackers may have corrupted a pirated version of Ubisofts anticipated game Watch Dogs with insidious Bitcoin mining software. According to the PC gaming site Gamecrastinate, a significant number of users downloading unauthorized Watch Dogs torrents reported a mysterious process called winlogin.exe (not the legitimate winlogon.exe) eating up to 25 percent of their CPUs processing cycles.