The internal structure of ChatGPT's bot detection system “Turnstile” and the full details of the Sentinel Challenge are revealed

A technical blog reverse-engineered ChatGPT’s Cloudflare Turnstile and Sentinel anti-bot systems.

The analysis says the checks combine browser, network, app-state, and behavior signals to spot automation.

It also describes XOR-based payload decryption, React hydration details, and proof-of-work challenges.

The findings matter for security research because they show how layered anti-abuse defenses can be studied and potentially bypassed.