Scan the QR code on a Certificate of Completion, or open the verification link printed on it. Every certificate resolves to e-sign.vertaflow.io/verify/<certificate-id> — this page, and no one else's.
VertaSign is VertaFlow's e-signature platform. It issues the seal, the PAdES/CMS signature and the audit trail behind this record — so an agreement can be checked here independently of the business that sent it.