This repository serves as a technical deep-dive into Google's reCAPTCHA system, particularly focusing on its obfuscation techniques, fingerprinting mechanisms, and anti-tampering measures. It includes extracted JavaScript snippets that implement specific browser fingerprinting signals (e.g., storage access checks, window opener properties, WebGL data extraction) and JSON files containing example fingerprint data. The repository also contains analysis of the now-removed BotGuard component, including its obfuscated virtual machine implementations. While the subject matter is largely historical due to the removal of BotGuard in April 2026, the repository provides valuable insights into the techniques used by advanced anti-bot systems.