Proofline — Evidence Gate for AI Agents

Workflow demo

Proofline Keeper applies the same evidence-gate pattern to a transaction firewall: inspect the proof receipt, block unsafe actions, and route exceptions for approval.

47-second continuous Proofline evidence run

Problem AI agents can produce confident outputs from stale or unverifiable sources, then trigger an external action without a reproducible audit trail.

Approach Proofline separates evidence collection from decisioning. It records provenance and freshness, applies explicit policy checks, and creates a tamper-evident proof packet before an external action is allowed.

Delivery • Deployed Google Cloud Run application • Deterministic pass or block decisions • Public evidence links and reproducible decision receipts • Nine automated tests • Live demo and Devpost case study

Outcome A reviewer can reproduce why a decision passed or failed instead of trusting opaque model output. No synthetic production results or commercial outcomes are claimed.

AI-assisted engineering; evidence rules and final behavior were reviewed before publication.