Who actually wrote that commit... you, or your AI agent?

The gap nobody's really tracking Your Git history can tell you that a workstation pushed a commit. What it can't tell you is who or whatactually produced the change. Was it you? An AI agent running inside your IDE? A CI job? Some vendor tool you forgot you'd wired in? For a long time that question was academic. It isn't anymore. The more code we write with AI in the loop, the shakier one quiet assumption gets: that there's a human author behind every commit. Audit trails, incident reviews, compliance workflows; they all lean on it. And it's breaking. Matrix Scroll is a small, open attempt to fix that. It attaches a signed provenance envelope to a commit, and anyone can verify it offline. What it actually does An agent-assisted commit can carry a signed JSON envelope that records: the actor (human or agent) the tool that produced the change an optional bounded scope an Ed25519 signature over a canonicalized version of the manifest The signing input is strict and frankly kind of boring — which is the entire point. It has to be reproducible byte-for-byte across implementations, so: the top-level signature block is stripped before signing object keys are sorted recursively compact separators, ASCII escaping, UTF-8 bytes no NaN, no Infinity The device ID comes from the first eight uppercase hex characters of SHA-256(public_key), formatted as MS-XXXX-XXXX. Verifying is the easy part: take the canonical manifest bytes, check them against the embedded public key and signature. No central service in the middle. Try it without installing anything There's a browser verifier that runs entirely client-side. Nothing gets uploaded: (̿▀̿‿ ̿▀̿ ̿) : https://matrixscroll.com/verify/ Give it ten seconds: Hit Load Commit Envelope → Verify Signature . You'll get VALID, plus the device ID, mode, algorithm, and canonical byte count. Now hit Tamper Sample → Verify Signature again. It flips to INVALID and tells you exactly what broke — e.g. "Device ID mismatch: expected MS-4319-20D5, manifes