# Keys in Gate Capsule

- **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:** [E N](https://cerebralvalley.ai/u/GG-QandV)
- **GitHub:** https://github.com/GG-QandV/keysingate-capsule
- **Demo video:** https://youtu.be/kZQ4V0r1GoI
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2702

The problem
When an AI agent turns down an insurance claim, flags a bank customer or rejects a job applicant, the only record of what it did usually sits in the logs of the same company that ran it. In a dispute, that record is a claim, not proof: the platform can edit it, lose it, or show only the parts that help it. And new rules (the EU AI Act from August 2026) already require automatic event logging for high-risk AI systems.

What I built
Keys in Gate gives the agent a capsule: a "flight recorder" for AI agents. It is one 6 MiB file that looks like random noise and has no doors. The agent, built on Muse Spark, writes every step of its work into the capsule as a signed page; every model call and every SAM 3.1 image mask becomes a page too. Nothing inside can be pulled out or quietly rewritten: not by the agent, not by the platform, not by us.

When a dispute comes, the holder hands an expert only the pages they choose. The expert checks them offline with an open-source program: no account, no network, no trust in anyone's server. One changed byte, and the page is REJECTED.

The demo
A real-life scene: a disputed $3,200 insurance claim after water damage. The agent's decision is recorded page by page, a forged page is caught, and a judge page explains the case where every sentence cites a verified page. A program, not a model, refuses a citation to a missing page.

Built during the hackathon: the capsule, the Muse Spark agent recording through MCP, offline checks, anchors on Solana and Base. Each claim is mapped to its evidence in demo/CLAIMS.md.

Try a free capsule (beta): https://capsule.keysingate.com

## More from Meta Global AI Developer Hackathon

- [ProofLoop](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2699)
- [Timon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2700)
- [CleopetraVerse](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2701)
- [Aura](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2703)
- [VIGÍA](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2704)
- [SafeSphere AI](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2705)

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Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2702. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt