Aiming at the problem of image tampering and forensic localization. a fragile watermarking algorithm based on chaos sequence and image QR decomposition was proposed to determine the image tampering. The algorithm chooses QR decomposition to decompose the image. embeds the watermark after the image is decomposed. https://www.spidertattooz.com/OPI-GelColor-The-Color-That-Keeps-On-Giving-0-5-oz-HPJ07-p22791/