OGS | SDNA™ redefines autograph authentication by certifying not just the item — but the documented proof of the exact moment the signature was made. No assumptions. No blind trust. Only verified evidence.
Traditional autograph authentication relies on stylistic comparison — an expert looks at a signature and gives an opinion. That's not enough.
SDNA™ (Signature Documentation & Note Authentication) is the certification division of Opulence Grading System® that demands real, tangible proof: photographs and videos from the exact moment of signing.
If there is no documented evidence of the signing event, we don't issue a certificate. This isn't a limitation — it's what makes SDNA™ the most trustworthy standard in the hobby today.
"We don't just certify a signature. We certify the moment it was born."
— OGS | SDNA™ Founding PhilosophyEvery SDNA™ certification follows a strict protocol designed to eliminate doubt and establish irrefutable proof of authenticity.
You bring your piece — a jersey, ball, card, poster, or any collectible — along with your request to obtain an SDNA™ certification.
The signing must be documented in real-time. We require clear photos or video footage showing the player signing your specific item — no exceptions.
Our team at OGS examines every piece of submitted evidence. The signature, the item, the timestamp, and the documentation are all cross-verified with precision.
Once approved, your item receives an official SDNA™ certificate — serialized, traceable, and permanently tied to its proof of signing. A chapter written in gold.
We never authenticate a signature without documented proof. If we can't see the moment it happened, we don't sign off on it.
Every certificate is backed by a documented file of evidence that travels with the item — photos, video, timestamp, location.
Forged signatures and mis-attributed items have plagued the hobby for decades. SDNA™ makes them impossible to hide behind a certificate.
The evidence behind your certificate is always accessible. You don't have to trust us blindly — the proof speaks for itself.
SDNA™ was built on principles that put the collector, the market, and the truth first — always.
Every certification we issue is backed by a complete evidence dossier — not just an opinion. Photos, videos, dates, locations: the full picture.
The signing event must be captured as it happens. Retroactive claims without evidence are not accepted, regardless of the item's value or provenance story.
Once certified, a piece carries a permanent, serialized record. Limited editions are fully tracked — when they're gone, that chapter of history closes permanently.
OGS is a premium grading and authentication brand built to serve the most discerning collectors in the sports memorabilia and trading card markets.
With a reputation built on precision, luxury presentation, and uncompromising standards, OGS has established itself as a benchmark of quality and trust in the collectibles industry.
SDNA™ is its specialist division — born from the need to bring the same level of rigor to the authentication of autographs that OGS applies to grading.
Ready to Certify?
Submit your item and documentation to OGS | SDNA™ and receive the only certificate in the hobby that actually shows the world where, when, and how the signature happened.
All tiers require evidence submission — no evidence, no certification