In recent years，the crime of copying online games and operating “copycat” mobile phone online games for illegal profits has increased significantly. Usually，most of the data related to piracy and infringement in such cases are stored in the server or cloud. And to avoid detection，the perpetrators often separate the illegal profit from the account of the company operating the pirate website. In a typical criminal case of copyright infringement sentenced in 2018，the court made use of the date of e-commerce payment platform and the characteristics of the “mobile game” marketing model，determining the amount of the crime of online game piracy with the sales amount of virtual currency，which is of exemplary significance in combating such new type of crime.