Technical forensic specification explaining how BotRefund analyzes browser environments and network invariants to distinguish novel retail browsers from server-side automation.
Standard production browser installations on macOS, Windows, iOS, and Android bundle proprietary, licensed media codecs (H.264, AAC, MP3) and Google Widevine Content Decryption Modules (com.widevine.alpha) for encrypted digital media playback.
Stripped headless Chromium binaries running in Linux server containers omit proprietary Widevine CDM binaries and licensed codecs due to licensing costs, causing hardware decryption to fail immediately upon initialization.
MediaSource & Hardware Codec Matrix Divergence (Arkose Labs BDA): The client environment claims to be a desktop retail Chrome/Safari platform but lacks native hardware-accelerated H.264 (`avc1.42E01E`) and AAC (`mp4a.40.2`) media decoders or falsely reports positive playback support for canary bogus codecs. Genuine consumer Windows/macOS installations always bundle proprietary media decoders, while headless Linux server containers and stripped Chromium builds lack licensed media binaries.
Ad Platform Fraud Classification: Under Google Ads Invalid Traffic guidelines (Automated Click Activity) and Meta Advertising Integrity standards, sessions exhibiting Media Codec Hardware Divergence violate fundamental consumer hardware invariants. They fail deterministic silicon rasterization, protocol compliance, or neuromuscular biometrics.
Why This Proves Non-Human Origin: Genuine consumer browsers on retail operating systems execute this API natively with verified hardware backing. Server software (headless cloud containers, unpatched automation harnesses, and proxy tunnels) cannot replicate this execution environment without incurring prohibitive server hardware costs.
Evidence Dossier Invariants: Each disputed click in our export packet matches an immutable server-side timestamp, landing URL, GCLID/fbclid, and observed IP address with zero client-side tamperability.
Human Baseline & Exception Scenario: Unbundled open-source Chromium packages on barebones Linux distributions without non-free codec libraries.
BotRefund operates a multi-vector ensemble model. This signal adds objective forensic weight to the session dossier but never acts in isolation. Positive verdicts require corroboration across network routing, hardware silicon, and cursor kinematics to guarantee 99% precision.
This signal registers an objective, mathematically verifiable anomaly on the session ledger.
BotRefund correlates L4 packet timing, GPU silicon, and cursor jerk before finalizing risk.
Compiled directly into Google Ads and Meta refund packets with verified click IDs and server logs.