01
Signed tag
Each chker tag carries an HMAC-SHA256 signature. That is the cryptographic mark — not a logo, not a barcode anyone can reprint.
Authenticity for revenue-protection teams · under one second
Verification that catches copies
and fakes in one second
One scan tells you if any code or tag is real, copied, or fake. Works on a phone or Meta Ray-Ban Display smart glasses, with a live fraud map.
REALCLONEFAKE
Product
In the app
The screens brands already scan with
How it works
Signed tag. Scan. Verdict.
HMAC-SHA256 on the tag, then a signature check and a single-use registry. Under one second.
02
Scan and check
One scan verifies the signature, then asks a single-use registry if this tag has already been seen. Copied tags fail the second check.
03
Verdict under one second
REAL (Authentic) — first genuine use. CLONE (Already Used) — a copy of a real tag. FAKE (Counterfeit) — the signature does not check out.
Chker also reads existing third-party barcodes and QR codes. Full cryptographic proof — signature plus single-use — requires chker-signed codes.
Use cases
Built for the rail, not a portal.
Field teams scan on a phone or Meta Ray-Ban Display 009B. History, alerts, and enrolment sit behind the same product graph.
- Barcode and QR capture with flashlight and manual entry
- HMAC-SHA256 signature plus a single-use registry
- Hands-free checks on Meta Ray-Ban Display 009B
Features
Everything in the scan, and behind it.
Authenticity, enrolment, and inspector audits for revenue-protection teams — one product graph.
Rail-first scan
Live camera, flashlight, and manual entry at goods-in, aisle, or POS — where leakage actually happens.
Signature check
HMAC-SHA256 on the tag, then a single-use registry. Copies fail the second check.
Instant verdicts
REAL, CLONE, or FAKE — under one second. Never a vague middle ground.
Manufacturer dashboard
Add SKUs and batches, generate QR sets, upload pack photos, watch scan volume.
Inspector Mode
Field checks stored with verdict, notes, and history for the next audit.
Phone + Ray-Ban Display
Same flow on a handset or Meta Ray-Ban Display 009B for hands-free rail checks.
Contact
Book a Pilot
Tell us the catalogue and the rail you need protected. We’ll set up a short pilot with your SKUs.
FAQ
Frequently asked questions
Who is chker for?+−
Revenue-protection teams stopping copies and fakes on the rail. Inspectors and brand ops enrol tags and run field checks on the same registry.
How does a scan decide?+−
A chker-signed tag is HMAC-SHA256. The scan checks the signature, then a single-use registry. Under one second you get REAL (Authentic), CLONE (Already Used — a copy of a real tag), or FAKE (Counterfeit). No middle-ground verdict.
Can chker read barcodes we already print?+−
Yes. Chker can read existing third-party barcodes and QR codes. That lookup is useful, but it is not cryptographic proof. Full proof — signature plus single-use — requires chker-signed codes.
What is Already Used?+−
A tag whose signature is valid, but the registry already recorded that unique mark. That is how a copied genuine tag is caught.
Where does it run?+−
On a phone, and on Meta Ray-Ban Display smart glasses. The verdict is the same. A live fraud map shows where clones and fakes appear.