CheckCOA – All-in-One Certificate Verification

I started collecting autographs in 2006. Back then, the hardest part wasn't finding items — it was figuring out what (and who) to trust.

Every provider had its own certificate format, its own verification page, and its own rules. If you were buying from a marketplace, you'd end up opening five tabs, copying numbers back and forth, and still wondering: Is this COA real? Is the number legit? Am I missing something?

Over time, I learned the landscape: which authentication companies are reputable, how their COA systems work, and what red flags to watch for. But the hobby changed — fast.

The problem got worse (a lot)

In the last 3–5 years, counterfeit certificates and forged autographs have shifted from occasional incidents to a mass problem. Better printing, easier replication of stickers, and faster distribution through online marketplaces made fake COAs and reused certificate numbers far more common — especially for popular, high-value celebrities and athletes.

Even worse, some basic certificate numbers you see online today are already compromised — reused across multiple fake listings or linked to known counterfeit paperwork. A normal certificate lookup might show a record exists, but it won't always tell you whether that number has been abused in the wild.

That gap is what pushed me to build CheckCOA.

Why I built CheckCOA

At first, it was a private tool: a way to run COA lookup and certificate number verification across the providers I personally used — without jumping between dozens of sites. I also wanted a clean place to save results into History, organize items into Collections, and keep a Wishlist.

But the bigger project was something I had already been doing for years: tracking counterfeit activity.

The Fraud Alert database

For a long time, I maintained my own database of compromised certificate numbers — the ones I saw on forums, in collector communities, and in suspicious marketplace listings (especially eBay). I cross-checked from competent sources and community reports (including names collectors often reference like G.O.A.T. Authentics, Tiffanycards, and others), and kept adding to it every time I spotted patterns of reuse or known counterfeit paperwork.

Today that database includes 15,000+ flagged entries.

So I combined both worlds:

Provider verification (COA / certificate lookup from official sources when available)
Fraud Alert (signals when a number is known or strongly suspected to be compromised)

What CheckCOA does

CheckCOA is an authenticity checker for collectibles built to make verification simple:

All-in-one verification: check certificate numbers across 25+ autograph and grading providers in one place
Fast workflows: scan a QR, use your camera, upload an image (OCR), or type the number
Clear results: returned fields are shown as-is, in clean readable format
Fraud Alert (always on): warnings when a number is flagged, repeatedly reused, or reported as compromised
Collector tools: History, Collections, Wishlist, exports and bulk tools (depending on plan)

A realistic promise

CheckCOA won't stop every scam. New fakes appear daily, and not every counterfeit uses a known number.

But it can significantly reduce your risk by helping you avoid:

certificate numbers that are already known to be compromised,
repeated numbers showing up across suspicious listings,
and common verification mistakes (wrong provider, mistyped digits, mismatched labels).

My goal is simple: make it easier to buy, sell, and collect with confidence — and make fraud harder to get away with.

Collect smarter

If you're a collector, you already know the feeling: the excitement of finding the right item… and the stress of wondering whether it's legit.

CheckCOA exists so that verification doesn't feel like detective work every time.