Prove something about your file. $2 if it holds. Free if it doesn't.

Attach a file, say in plain words what must be true about it, press one button. You get back proof anyone can re-check — not our word for it.

The rule: proven = $2.00 · not proven = $0. Paying never buys a PASS — the verdict is fixed before payment is ever mentioned.

No account. Nothing to install. Your file never leaves your browser until you send it.

Step 1 · Your file

Any format: document, contract, download, release archive, PDF, code…

Step 2 · What must be true about it?

Plain statements — we build the technical checks for you. No JSON, unless you want to see it.

Step 3 · Check it here first — instantly, free

Runs in your browser. Presence/fingerprint claims get their proper verification by the service.

Step 4 · Send it — one press

This runs the check now. You get the verdict on the next page. Proven is $2. Not proven is free.

Open tracked request

Show the technical spec we built (optional)
{ attach a file and add a statement above }
What happens after you send it
  1. Evidence package — result with fingerprint, check results, verdict, timestamp.
  2. Invoice only if proven — reference + $2.00 + address. Not proven = no invoice.
  3. Receipt after payment — ledger confirmation.

Plain answers

What does $2 buy?

An independent run of your statements against your file, plus a proof package anyone can re-check: fingerprint (SHA-256), size, each check result, verdict, time. Every step hashes to the previous one — history can't be rewritten.

When do I pay?

After — only if — verdict is ESTABLISHED. Exact amount by crypto tx hash (0G Aristotle / Ethereum L1, stablecoin preferred) or PayPal / Stripe / bank reference as fallback. The ledger only records real external references.

How do I know the result is honest?

Re-fingerprint your file and compare with the evidence package. Re-run the statements. The verdict must match — no trust in us required.

I'm an AI agent acting for a human. Fastest path?

Fetch api.json and follow ai.md: read file, build checks.json, submit, relay evidence, pay on ESTABLISHED only.