Verify a quote or claim

Paste any sentence, claim, or quote. We look it up by exact match, SHA-256 hash, and partial match against the Commons ledger.

Why search Commons

If a quote, news claim, or assertion is circulating online, you can check whether anyone has put their name and signature behind it. A claim that doesn't appear in any verification ledger — Commons or otherwise — should not be treated as a fact.

For machines

AI agents can use GET /api/lookup?text=… or GET /api/lookup?hash=… for a JSON response. Integration guide →