Tabulas DID + VC demo
One material. Many claims. One identity.
Porotherm 25 N+F at Residentie De Lindeboom (Bruges, Mar 2026). Four signed credentials; cryptographic check is per claim.
- Product
- Porotherm 25 N+F
- Manufacturer
- Wienerberger EOOD
- Site record
- Bouwwerken Vandevelde · Sint-Andries
- Scope
- Demo EPD chain (not official)
Credential signatures
○ not checked yet · ✓ proof OK · ✗ proof failed — tap to run the same Verify as in the table (one at a time).
did:web:tabulas.eu:materials:wienerberger:porotherm-25-nfLoads did.json for this did:web id (same host as this page) and opens it under Its identity.
The claims
Expand a row for the issuer line, then Verify or use the passport chips above. The pipeline below follows the active claim.
| Claim | Issuer | Summary | Valid from | Check | Actions |
|---|---|---|---|---|---|
| Collapsed — expand the claim | Not checked | ||||
| Collapsed — expand the claim | Not checked | ||||
| Collapsed — expand the claim | Not checked | ||||
| Collapsed — expand the claim | Not checked | ||||
Verification pipeline
Click Verify on a claim row to run the five checks here — without leaving this section.
Why this matters
A signed claim is a JSON file with a tamper-proof seal. The seal is made once, by whoever's making the claim. After that, anyone in the world can check the seal without contacting the original sender. If the seal checks out, two things are true: the claim was really made by the party whose seal it is, and not one character has been changed since. The seal doesn't prove the claim is true — that's what independent verifiers are for, and they get their own seal too. What it proves is that the trail of who said what, and when, can be followed and trusted without depending on any single platform staying online. That's why your EPD becomes durable. Not because we host it — because the seal is yours, and it travels with the data.
Your signature stays on your data.
Wienerberger's environmental declaration is no longer a PDF in someone else's database. It is a signed claim, with Wienerberger's name on it, that anyone can verify against Wienerberger's public key. The data cannot be edited without breaking the signature.
The verifier stays attached.
Dr. Minkov of greentability verified this EPD on June 17, 2025. That verification is itself a signed claim, attached to Wienerberger's declaration. Fifty years from now, when this building is renovated, the new owner will still be able to prove that this material was independently verified — and by whom.
The platform is replaceable. The trust is not.
If Tabulas disappears tomorrow, these claims still verify. The cryptography does not depend on us being online. That is what separates digital identity from a database entry.
What's next
Tabulas v2 anchors these identities to IOTA, removing the last dependency on any single platform. Coming summer 2026. Talk to us