Proof of What You Shipped.
TamperKit security stickers contain a secure NFC chip that generates a new cryptographic code on every scan. Tap before you ship, tap when it comes back, and export evidence that marketplaces and courts can verify.
See How It Works Read the FAQ
How It Works.
Activate the Tag.
Apply a sticker to your item or over the box seam and tap it in the TamperKit app. Write your own record — what is inside, an order number, whatever proves the shipment. It is written once and becomes sealed and immutable. No codes, no sign-up: holding the tag is the only key.
Ship It.
Your activated record and, on TagTamper (TT) tags, the tamper status travel with the package. Every scan is verified on our servers and its time is fixed by an independent timestamp authority.
Verify on Return.
Anyone can scan to confirm the tag is genuine and activated — your record itself stays private to you. On a TagTamper (TT) tag the status shows intact, opened, or opened-and-re-glued — documented on the spot, ready for your dispute.
Two Variants.
| Capability | Standard | TagTamper (TT) |
|---|---|---|
| Cannot be copied, photographed, or reprinted. | Yes | Yes |
| Identifies the exact unit, not just the model. | Yes | Yes |
| Independently timestamped scan history. | Yes | Yes |
| Chip-recorded proof the seal was ever opened. | No | Yes |
| Detects a re-glued or re-taped seal. | No | Yes |
The TagTamper (TT) variant is a 25×50 mm tamper-evident label built on the NXP NTAG 424 DNA TT chip. Its tamper loop runs through the label's tail, which you place across the box opening. On every scan the chip reports two facts inside its cryptographically authenticated response: whether the seal has ever been opened — recorded permanently the moment the chip is powered with a broken loop — and whether it is open right now. That second reading is what defeats the careful fraudster: a seal that was cut and glued back reads "opened, currently closed." Choose TagTamper (TT) for high-value electronics and factory-sealed goods; the standard 25 mm round sticker covers everything else.
Specifications.
| Standard | TagTamper (TT) | |
|---|---|---|
| Chip. | NXP NTAG 424 DNA | NXP NTAG 424 DNA TT |
| Label size. | 25 mm round | 25×50 mm (D×L), tamper-evident material |
| Tamper detection. | — | Once-opened (permanent) and current-status loop detection |
| Protocol. | ISO/IEC 14443-A, NFC Forum Tag Type 4 — 13.56 MHz, read range up to 10 cm | |
| Cryptography. | AES-128 with SUN message authentication on every read; ECC originality signature; random ID and encrypted UID privacy options | |
| Endurance. | 50-year data retention; 200,000 write cycles; operating range −20°C to 50°C | |
Evidence a Third Party Can Check.
Every scan is verified server-side and written into a hash-chained log. The chain is anchored hourly with an RFC 3161 timestamp from an independent authority, so the history cannot be rewritten after the fact — not by a seller, and not by us.
When you need to fight a claim, export the evidence report. It carries a verification link on this domain: the reviewer opens it, sees the record rendered live from our database, and confirms it matches your document. No accounts, no software, no cryptography degree required.
Frequently Asked Questions.
Is it allowed to put stickers on products I resell?
Yes. No Amazon or eBay policy prohibits a removable security sticker. Do not cover barcodes or safety labeling, and for collectibles place the sticker on your shipping box rather than the retail packaging.
Does this override marketplace return policies?
No, and nothing does. TamperKit documents; it does not deny returns. Its value is evidence for SAFE-T claims, A-to-z responses, eBay appeals, and chargeback disputes.
Do I need an account or a code?
No. There is no login, no sign-up, and no code to type. TamperKit never collects who you are — physically holding an unactivated tag is the only key, and the first record written into it is permanent. You buy the tags and you are done.
What if a tag is already activated when I open the pack?
Do not use it — that pack was opened before it reached you. Every pack ships physically sealed, and a tag can only be activated once, so a pre-activated tag is itself proof of tampering. Return the pack for a refund like any other damaged product.
Who can see my proof?
Only you. A scan shows that the tag is genuine, activated, and — on a TagTamper (TT) tag — its tamper status; the record details never appear. You read them in the TamperKit app as the activator, and you choose when to share them, by exporting the proof or sending a verification link for a dispute.
Does it work with FBA?
Fully for merchant-fulfilled orders. For FBA, label your inventory with the Amazon barcode (FNSKU); commingled inventory is unsupported because the unit you tagged may not be the unit your buyer receives.