# edgetrace

- **Event:** [OpenAI GPT-5 Startup Hackathon](https://cerebralvalley.ai/e/gpt5)
- **When:** Aug 9 at 10:00 AM – Aug 10 at 5:00 PM (PDT)
- **Where:** Location TBA
- **Team:** [Kyle Orciuch](https://cerebralvalley.ai/u/korciuch)
- **GitHub:** https://github.com/edgetrace/verbose-parakeet
- **Demo video:** https://github.com/edgetrace/verbose-parakeet/blob/main/explainer.mp4
- **Gallery:** https://cerebralvalley.ai/e/gpt5/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gpt5/hackathon/gallery/74

Invisible Chroma-DC Watermarking (Prototype).
We embed pilots + payload by nudging U/V chroma DC in fixed ROI blocks. Bits repeat across frames; decode uses pilot correlation with polarity flip and majority vote. The current decoder subtracts background (wm−bg). The notebook reports BER pre/post-encode and Δsize for IVF/MKV/WebM to quantify robustness vs. bitrate cost.

Deepfake angle (today): this is not yet a cryptographic proof of authenticity. It’s a robustness watermark that lets us run provenance experiments: synthetic/edited segments often degrade the pattern—pilot correlation drops, BER spikes, or bits go missing—providing a practical signal to flag or down-rank at ingest.

Roadmap: swap random payload for signed fields (stream ID, timestamp, rolling hash), add near-blind/pairwise decoding (no background), and wire real-time gating with monotonic-time checks.

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Markdown version of https://cerebralvalley.ai/e/gpt5/hackathon/gallery/74. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt