# Yoonchang Han (Solo Team)

- **Event:** [Claude Build Day](https://cerebralvalley.ai/e/claude-startups-build-day)
- **When:** Sat, Jun 13 at 9:00 AM – 10:00 PM (PDT)
- **Where:** San Francisco, CA
- **Team:** [Yoonchang Han](https://cerebralvalley.ai/u/ychan)
- **GitHub:** https://github.com/Yoonchang/PatientZero
- **Website:** https://patient-zero-amber.vercel.app/watch
- **Demo video:** https://youtu.be/vqeyjPWCHLs
- **Gallery:** https://cerebralvalley.ai/e/claude-startups-build-day/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/claude-startups-build-day/hackathon/gallery/42

Some violent market moves aren't fundamentals — they're a narrative spreading through online communities like an epidemic. Patient Zero traces how: it finds the origin (the index case), traces the transmission across communities, countries and languages, and judges narrative vs. fundamentals. It explains; it never predicts prices or advises trading.

The differentiator is cross-country / cross-language transmission tracing — the documented blind spot of English-only sentiment tools. As a narrative spreads it jumps into non-English communities (a Korean forum, a Japanese board, a German retail site); Patient Zero places every post — in any language — on one timeline and identifies the index case wherever it sits, English or not, measuring the latency of each cross-language jump.

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