Directions for using the NFC Anti-Counterfeit Coin below the description 2 oz MintID Round. 999 is a privately minted silver bullion round that contains 2 troy ounces of. 999 fine silver (99.9% pure) and features built-in anti-counterfeiting tech. Key features Weight & purity: 2 troy oz. Download the app Get the MintID app from the App Store or Google Play. Make sure NFC is on Most modern smartphones already have NFC enabled On Android: check Settings? Connections? NFC On iPhone: NFC works automatically (iPhone 7 and newer) 3. Read the result Once scanned, the app will show: Authenticity confirmationUnique ID tied to that specific coin Scan history (if it’s been scanned before) 5.