Why Some COAs Are More Trusted Than Others
The four characteristics that make a Certificate of Authenticity credible — issuer reputation, lookup-ability, methodology disclosure, and aftermarket recognition.
Short answer
The four characteristics that separate trusted COAs from decorative ones:
1. Issuer independence
The COA issuer should not also be the seller. A dealer's COA on the dealer's own inventory is, structurally, a self-issued opinion. Third-party authenticators (PSA/DNA, JSA, BAS, SGC, CGC) are independent businesses.
2. Database lookup
You should be able to enter the COA number or sticker code into the issuer's public database and retrieve the original record. If the COA has no lookup, it has no audit trail.
3. Methodology disclosure
Recognized authenticators publish what they evaluate (signature consistency, pen pressure, surface response, signing patterns). A “COA” that says only “authentic” without methodology is a marketing instrument, not an authentication.
4. Aftermarket recognition
The clearest test: do the major auction houses and marketplaces accept this COA? Heritage, Goldin, Lelands, Bonhams, eBay, and StockX all maintain (formal or informal) lists of authenticators they recognize.
Why this matters more than people think
The COA isn't actually the asset — buyer confidence is. A COA from a service that no one recognizes contributes no confidence. A COA from a recognized service contributes ~80% of the value lift authentication can provide.