# PaperTrail

- **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:** [Rishikesh Ramalingam](https://cerebralvalley.ai/u/Rishikesh17)
- **GitHub:** https://github.com/Rishikesh0117/agentledger
- **Demo video:** https://youtu.be/aEgLp2kXKJM
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2028

AgentLedger is an accountability layer for AI agents. When an AI agent acts on someone's behalf — reading documents, looking up records, sending messages, updating data — there is usually no reliable record of what it did, whether it was allowed to do it, or who approved it. AgentLedger makes every agent action pass through a safety pipeline before it can execute: 
(1) a policy check against role-based permissions and rules, 
(2) review by a second, independent AI model (the "guardian") for risky actions, 
(3) human approval for high-risk actions, and 
(4) execution only after all gates pass. 
Every step — proposals, blocks, guardian verdicts, approvals, executions — is written to a tamper-evident, hash-chained audit log (SHA-256, append-only SQLite), so any later edit to the log is detectable and the exact altered entry can be named. The demo shows three things: a normal work-order task completed with human approval; a prompt-injection attack hidden inside a document, stopped twice by two independent layers (policy, then the guardian model, which explains in plain language that instructions inside documents are not instructions from the user); and a tamper test where editing one audit record directly in the database is caught by the built-in "Verify audit log" check. Built solo during the hackathon; all demo data is synthetic.

## More from Meta Global AI Developer Hackathon

- [PlusOne](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2025)
- [CoverPilot](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2026)
- [Hi-geo](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2027)
- [Admode](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2029)
- [EG.COM](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2030)
- [Kade](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2031)

---

Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2028. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt