Products
Everything We Make
We make StampCats collectibles, OnceMark tag packs, and TamperKit seal packs, with four apps and one validation service. Every chip is an NXP NTAG 424 DNA. We check its NXP factory signature before it leaves our hands.
Our Products
Collectibles, Tags, and Seals
Each product carries a chip we provision and connect to our validation service, ready for its first tap.
StampCats Collectibles
Each unit contains one collectible cat with original character artwork and its own virtual passport.
OnceMark Tag Packs
Makers and creators can mark their work or other collectibles with a permanent public record. Choose sealed packs of 25 mm round stickers or 25×50 mm TagTamper labels.
TamperKit Seal Packs
Sellers can document seals before shipping and on return. Choose sealed packs of 25 mm round stickers or 25×50 mm TagTamper seals.
Apps and Tools
Four Apps, One Validation Service
Each app is a different job on the same chips and the same service. Authenticate a tag, seal a shipment, issue your own product records, or take our house collectible around the world.
NFC Proof
iOS and Android
Scan any of our tags to see the verdict, counter, code, and validation result. With Save Scan History on, every scan goes into a log, giving your collection a record of checks.
It also verifies the chip's NXP factory signature right on the device, a check a browser cannot do. That confirms the silicon itself is genuine.
Visit the Validation Service
TamperKit
iOS and Android
The chain of evidence. TamperKit proves a tag was opened, was present somewhere, or was scanned by someone. Activate a seal, bind it to the shipment, and every scan afterward joins an independently timestamped evidence chain, including the hashes of any photos you attach.
If you sell collectibles, export cryptographic proof of the whole evidence chain to help combat return fraud or show the seal read intact on arrival. Your activation records and scan history stay private unless you share them. A stranger's scan shows only that the tag is genuine and activated.
Visit TamperKit
OnceMark
iOS and Android
The issuer. Makers and small brands write a product's record onto its tag once, permanently, with the metadata they choose. Serial, edition, materials, date, whatever the product needs to say about itself.
Anyone who scans it sees a genuine tag and the record you wrote, attributed to you as its author. No account needed on the buyer's side.
Visit OnceMark
StampCats
iOS and Android
The fun one, and our house collectible brand. Tap your cat at real places around the world and collect stamps in its virtual passport. Location is checked at the moment of the tap, so a stamp means you were really there.
Every cat is one of our chips underneath, with original characters by a world class artist on top. The passport travels with the cat, not with you, so the collectible carries its own history.
Visit StampCats
Where to Buy
StampCats collectibles, OnceMark tag packs, and TamperKit seal packs ship from our Amazon storefront.
