Proof about a person, not just a document
Embed a face portrait or fingerprint template inside the seal, cryptographically bound to the holder. Match the seal against the person in front of you — on-device, no database call.
Visible Digital Seal · ISO/IEC 22376
Seal trust into every document, product and person.
BioSeal turns a plain 2D code into a cryptographically-signed seal that proves who issued it, that nothing was altered — and, uniquely, who it belongs to. Verified in seconds, even with no network.
A Visible Digital Seal solution by id3 Technologies.
The trust stack behind every seal
BioSeal is the solution layer of the Visible Digital Seal ecosystem — it runs inside the Otentik Trust Network or any other scheme accredited by the VDS International Council.
Governance
VDSIC
Sets global VDS policy and interoperability rules; accredits scheme operators.
Scheme operation
Otentik Trust Network
Publishes the trust lists and signing certificates a verifier chains back to.
Solution
BioSeal
Issues and verifies the seals — via REST API, SDK and CLI — scheme-agnostic by design.
Why BioSeal
Not just a secure QR code — a portable proof of trust
Ordinary QR codes are open containers anyone can copy. A BioSeal carries its own proof of origin, integrity and ownership inside the code itself.
Verified offline, anywhere
Everything needed to trust a seal travels inside it. Once trust lists are cached, signature and biometric checks run locally — perfect for borders and field inspection.
No central database to breach
The data and biometric live in the signed seal, so verification needs no back-end lookup — a privacy-by-design, GDPR-friendly architecture with no honeypot.
Tamper-evident by cryptography
Each seal is signed with the issuer's private key. Change a single field and the signature no longer verifies — instant, provable tamper detection.
Standards-based & interoperable
Built on ISO/IEC 22376 within the ISO 22385 trust framework. Any compliant reader with the scheme's trust list can verify a seal — no proprietary lock-in.
Works on paper and on screen
Print it on a card, certificate or product tag, embed it in a PDF or wallet pass, or carry it on an NFC tag. The seal travels with the item across the physical–digital divide.
How it works
Create. Carry. Verify.
A three-step lifecycle that puts a verifiable proof of trust onto any document, product or credential.
01
Create
An authorized issuer assembles the data, optionally captures a biometric, and signs the payload with its private key. BioSeal renders a QR Code or Data Matrix.
02
Carry
The seal is printed, embedded in a document, or written to an NFC tag. It is now self-contained and travels with the item.
03
Verify
A reader decodes the seal, walks the trust chain, checks the signature — and matches the embedded biometric against the holder. All runnable offline.
Built for developers
Ship it your way
BioSeal is delivered three ways so you can issue on the server and verify at the edge.
REST API
Create, read and verify seals over HTTPS at bioseal.id3.eu — no cryptography to implement yourself.
Embeddable SDK
Native libraries for Python, C#, Dart, Java, Swift, C and C++ — for on-device issuance and offline verification.
Verification CLI
A command-line verifier for scripting, integration testing and back-office batch checks.
Seal trust into everything you issue
Talk to our team about issuing biometric, tamper-evident Visible Digital Seals — verifiable anywhere, even offline.