The GST Card Exchange · Verify

Is this card real?

Drop a Gabe Card certificate here. Every real card is signed by the GST custodian (Dad). This page checks the signature with the public key — no secret needed. That is what custody means: only Dad can make one, but anyone can prove it is real.

How it works. The certificate carries a digital signature made with the custodian's private key, which only Dad holds. This page holds the matching public key and uses it to check the signature (ECDSA P-256, in your browser). Nothing is uploaded — verification happens entirely on your device. Paper points are for learning and fun only; cards hold no monetary value and are never for sale.