# Substance Proof

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Divyesh Kumar Khadun](https://cerebralvalley.ai/u/Div007)
- **GitHub:** https://github.com/bsjuilla/substance-proof
- **Demo video:** https://youtu.be/HWEI16vu9Jw
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2760

Economic-substance and tax-residence rules depend on where directors physically are when the board meets. Jersey's Economic Substance Law requires a quorum of directors physically present in Jersey (Art. 5(3)(b)). Failing the substance test can mean fines of £10,000, then up to £100,000. Today someone checks that by hand, from minutes that only record what people claimed. Substance Proof is for whoever has to rely on minutes they did not write: an auditor, a tax adviser, a due-diligence team, or a trust company's compliance officer.

Substance Proof reads the whole meeting pack. SAM 3.1 blacks out QR codes on photos first (it also looks for faces and signatures); if that fails, the photo is not sent to the reader at all. Muse Spark reads minutes, boarding passes, e-tickets and hotel bills, quoting the words behind each fact. Muse Voice Transcribe turns the recording into a timed roll-call. Unit-tested code, not a model, decides NOT MET, REVIEW or EVIDENCED and flags where the minutes contradict the evidence. Muse Glimmer, Meta's open-weight model, re-reads every document independently; if its reading changes the answer, a person reviews. An approval-gated agent drafts follow-up emails, and code checks every tool call. Muse Spark can also turn a statute into rules, and code verifies every quote.

On 30 held-out meetings: 30/30 verdicts, 0 dangerous errors. When Muse Image re-photographed those meetings' travel and hotel documents as phone photos, all 30 verdicts held. On 16 harder, realistic packs designed by an outside reviewer: 38/45 directors placed correctly and 1 wrong result, explained in the README. I built all of it, solo, during this hackathon. Every person, company and document is synthetic. Not legal or tax advice.

Live demo (recorded real runs, no key needed): https://bsjuilla.github.io/substance-proof/

## More from Meta Global AI Developer Hackathon

- [AER12T](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2757)
- [Glance](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2758)
- [Modulate](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2759)
- [VibeEduTwin](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2761)
- [Orbi-t](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2762)
- [Project Wayfinder](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2763)

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