Check the slab. Verify the record.

Is this the chip linked to the certificate?

The planned label uses an NTAG 424 DNA chip. Each read produces a changing authentication code. SatGrade checks the code against the registered chip and checks the tap counter for reuse. A copied serial number cannot create a new valid chip response.

The chip opens a certificate link. A serial lookup, saved link or screenshot does not establish a fresh tap, and chip authentication alone cannot prove the card or physical seal is unchanged.

Does the certificate match its Bitcoin proof?

The certificate number, card identity, grade and subgrades are hashed into a Merkle tree. Its root is recorded in the OP_RETURN data of a Bitcoin transaction. The certificate proof lets a browser recompute that root and compare it with the on-chain record.

The Bitcoin commitment is on-chain, not stored inside the NFC chip. The certificate shows whether anchoring is pending or confirmed. Photographs are not included in the current commitment.

What the proof tells you

A matching proof checks the covered certificate fields. It does not independently establish the card’s authenticity, condition or value. The physical holder, chip installation and grading process each need their own checks.

More of the card, in view.

We want collectors to understand the assessment as well as verify the record. The planned starting point is clear front and back photography with readable card details. Close-up imaging and annotated condition reports are future development goals. We do not currently offer automated grading or a detailed scan report.