CertaScan
Verify a COA.
Confirm that a COA came from CertaSafe, that the copy you hold is unaltered, and what it was tested for. It never says more than that.
By secure code
The code is printed on the COA, in the form CS-XXXX-XXXX-XX.
Or by COA identifier and lot
Both are printed on the COA. Both are needed: an identifier on its own resolves nothing.
By the file itself
The strongest check available. It compares the exact bytes of your copy against the bytes CertaSafe released, so a single altered character does not match.
The file stays on your device. Your browser computes its fingerprint and sends only that.
A COA that has been printed and scanned, re-saved by a viewer, or edited in any way produces a different fingerprint and does not match. That is the check working, not a fault in your copy: verify by code as well, and the record will tell you what CertaSafe released.
What verification does not do
It confirms authenticity and shows the tested scope. It is not a statement that a product is safe, suitable for any use, lawful to sell, or compliant with any standard, and it covers one sample from one lot rather than a product line. Only the customer who holds a COA can authorize it for public verification, and they can withdraw that at any time.