SourceStamp: prove where every fact came from.
The verification discipline this business runs on, built into your browser. Highlight a fact on any public-records page, press one key, and SourceStamp keeps a receipt — the page, the time, the surrounding context, even the table row. When someone asks “where did that number come from?”, you answer in one click.
Install in two minutes
SourceStamp isn't in the Chrome Web Store yet, so it installs the developer way — same extension, one extra click:
Grab the zip below and unzip it anywhere on your computer.
Type it in Chrome's address bar, then switch on Developer mode (top right).
Click “Load unpacked” and select the unzipped SourceStamp folder. Done — the stamp icon appears in your toolbar.
On any county page, highlight a fact — a surplus amount, a sale date, a case number — and press Alt+S. Name the case, save the receipt.
Pair it with the Starter Map.
The Starter Map teaches verify-before-you-trust: the list figure is a lead, the record is the truth. SourceStamp is how you keep the proof. Working a county list, you'll capture the surplus entry on the docket, the sale date, the owner of record — and every receipt lands under its case, with a citation you can copy straight into your tracking sheet.
- Alt+SCapture the highlighted fact to a case
- PopupBrowse receipts by case, copy a clean citation
SourceStamp is open source (Apache-2.0) and completely private by design: it makes no network calls, collects nothing, and stores receipts only on your own computer. We built it because our own operation needed it. It's free because provenance discipline makes the whole niche better — and because it shows you, in two minutes, how this community thinks about proof.
Want to see the discipline it comes from? Join the free community.