A living, verifiable record of how a building can change.

Adaptability assessed layer by layer, circular-economy evidence kept with the model, and passport revisions signed by this server so that anyone can check them.

Verify a passport Get the desktop app
  1. Site
  2. Structure
  3. Skin
  4. Services
  5. Space plan
  6. Stuff

Verify a passport

Choose a passport as JSON, an IFC model with an embedded passport, or an Excel export. The file is checked in your browser against this server's public keys and is not uploaded.

1

Canonicalise

The passport JSON is put in RFC 8785 canonical form, so formatting never matters.

2

Hash

A SHA-256 digest of the canonical text identifies the exact content.

3

Sign

The server signs the digest with Ed25519. Its private key never leaves the server.

4

Check

Anyone recomputes the digest and checks the signature with the public keys.

The DDAP desktop app

Managers, auditors and viewers work in the desktop app for Windows and macOS. Sign in with the server address https://ddap.graphblob.com.

macOS: the app is not notarised by Apple. The first time, right-click DDAP.app and choose Open.