SealTrust links a physical product to a cryptographically verified record you can check yourself. Tap the NTAG 424 DNA chip with a phone, and its authenticity is confirmed against proof anchored on a public blockchain.
This page walks through it as one story, in five short chapters — each with a two-minute video and a plain-language explanation.
Every product carries an NTAG 424 DNA chip. Tapping it with any NFC phone — no app required — sends a one-time cryptographic code that our service verifies in seconds.
A successful check means the chip is genuine and the item matches its on-chain record: a tamper-resistant entry written to the Base blockchain when the product was first registered. Anyone can re-run the verification, so trust never depends on taking our word for it.
One tap turns a physical product into a record you can verify independently.
How SealTrust works — a two-minute overview
A convincing fake can copy a label, but copying the chip's cryptographic behaviour is far harder. SealTrust watches the pattern of scans to spot tags that don't add up.
When the same identity appears in two distant places at once, when a scan counter rolls backwards, or when a previous code is replayed, the system flags it and folds the signal into a live trust score — so suspicious activity surfaces instead of slipping through.
Cloned and replayed tags are detected automatically and scored into a live trust signal.
Clone detection — catching counterfeits
Authenticity is one half of the story; what a product is made of is the other. SealTrust gathers materials, suppliers, lifecycle events and compliance details into a Digital Product Passport aligned with the EU's ESPR regulation.
The passport travels with the item and is exportable as structured, interoperable data. Different audiences see the right level of detail — what's public stays open to everyone, while sensitive fields stay reserved for authorities.
Materials, suppliers and compliance, gathered into an ESPR-aligned passport that travels with the product.
The Digital Product Passport, explained
The trust starts in the hardware. The NTAG 424 DNA chip holds keys written at the factory that are never exposed and cannot be read back off the tag.
On every tap, the chip generates a fresh, single-use code derived from those keys. A captured code can't be reused, and an attacker who can't recover the keys can't produce a valid one — which is what makes the chip clone-resistant rather than simply hard to copy.
Factory-written keys and a fresh code on every tap make the chip clone-resistant.
NTAG 424 DNA security, explained
Issuing or retiring a product on-chain is a sensitive action, so SealTrust doesn't leave it to a single key. The most critical operations sit behind a Gnosis Safe — a multi-signature wallet that requires several approvals before anything executes.
With an M-of-N policy, a quorum of authorised signers has to agree, and every approval is recorded on-chain. No lone key can mint or burn on its own, which removes a single point of failure from the most consequential steps.
Critical on-chain actions need a quorum of approvals through a Gnosis Safe — no single key acts alone.
Multi-signature governance, explained
The fastest way to understand SealTrust is to use it. Verify a product, open a sample Digital Product Passport, or talk to us about your catalog.