Pingcoin is the digital version of the classical "ping test" for catching counterfeit coins. By recording and analyzing the sound produced by your coins the app is able to tell you if the coin is genuine or fake. If you've ever found yourself not quite 100% sure about a coin's authenticity, try the ping test with the Ping Coin app. It will prevent you from getting fooled by counterfeit coins and it you will have peace of mind purchasing from even the shadiest coin sellers at fairs and garage s