Except for the third photo, which is somewhat useful, the other two are useless. The third picture: The wrist set cover is laser-etched in light yellow (or light gray) color GIANT, which cannot be done by imitation goods (the cost is high), and the clockwise arc-shaped font is consistent with Giant's style. This etched word cannot be erased with Tenna or other paint thinners (because it is a groove burned on the surface of the aluminum alloy), so this photo is of some use. . . There is no need to scan the QR code at all. This car is too old. There should be no QR code information. It is only the detailed photos that speak for themselves. Important identification parts: 1. The crankset (together with the crank) and the atx series are all manufactured by Haomeng. Haomeng’s crankset has its own design features. An experienced person will know at a glance that the fake crankset is from a workshop. The appearance and structure are not good at first glance (for example, the crank is thin and thin). 2. The transmission kit includes thumb shifters, front derailleurs and rear derailleurs. Although Giant ATX is the bottom series, it also uses Shimano and MICROSOFT. These trademarks are printed on the transmission kit. Still sitting. Due to cost reasons, counterfeit goods are produced by small brands that cannot be sold on the market. Currently, Japan's Shimano and American SRAM are two big brands that account for 80% of the global share of transmission kits. The others are Taiwanese micro-shifters and Italian Torx. (Colnago), just these four. 3. There is usually a sticker with the word GIANT on the rim. All three points are met and it is considered genuine. . . See for yourself and learn some introductory knowledge about mountain biking to avoid detours. . . The previous answer of "look at the 15-digit frame number under the bottom bracket" is not necessarily true, because ATX6xx is low-end and the car is very old. It is definitely not a 15-digit code, and many cheap cars are sold "cross-region" , this kind of car, the seller (or store) has to "remove the code" (that is, remove a few or all the code numbers). For the 2017, 18, and 19 XTC series and the higher XTC SLR series, you can see the code on the bottom of the bottom bracket (but it is useless if the code is polished).