# NirmanOs

- **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:** [Anuj Singh](https://cerebralvalley.ai/u/Anuj2285)
- **GitHub:** https://github.com/ajnasa2285/hisaab-bridge
- **Demo video:** https://youtu.be/4rWi071hFh0
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1726

Small businesses in Indian construction (contractors, JCB owners, material suppliers) each keep their own notebook. Hours, bags and payments are written separately on each side, the numbers don't match at the end, and someone loses money in the argument.

Hisaab Bridge gives each business its own AI agent. The agents talk to each other with signed messages (Ed25519), and to their people on WhatsApp in Hindi: a supervisor's voice note becomes a JCB request, the operator's meter photo becomes a reading, a challan photo becomes a delivery. Each agent keeps its own hash-chained ledger, and each side holds the other's signed receipts, so neither record can be quietly changed. Meta's Muse Spark understands messages and reads photos, and Muse Voice Transcribe handles voice notes. Code does every calculation and check, and a person approves every step.

It runs live on AWS. On 2 and 3 November it handled two real JCB jobs from request to cash settlement, with a real JCB owner, real meter readings and real cash. A test material order showed a wrong bill being corrected without rewriting history. A judge page checks every signature in the browser.

Today: one server, one WhatsApp number, two real jobs, no paying customers yet.

## More from Meta Global AI Developer Hackathon

- [LEGO from My Bricks](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1723)
- [PA Cafe Cart Showroom (小屋購物車)](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1724)
- [gwenlake](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1725)
- [The Ground](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1727)
- [Lewis Muguna](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1728)
- [SEO Noobs](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1729)

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