It is web service which will detect unique system using user agent of the system and we find any fake user agent which is not available in side our database we will show him unsolvable captcha.
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36
Googlebot-Image/1.0
The solution to verify the authenticity of a received User Agent
- The below given image is an example of the canvas which the server requests the browser to draw.
Some 35 different canvases are collated below to show how they change from browser to browser and OS to OS.
