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MATTR

Sample Credential Verification For QR Code Presentations

Description

This app allows you to scan a QR code which is presenting a CBOR-LD VC, decode and verify it using MATTR services.

Installation

Get Started

Cloning the samples-apps repo

git clone https://github.com/mattrglobal/sample-apps

Change to the directory and install dependencies

cd verify-cborld-presentation
yarn install
yarn build

Rename .env-template to .env and provide the details from your tenant.

Configure your trusted credential issuers in .env file as a comma separated list of domain+did. domain can be left empty in which case the entry would look like +did. When domain is defined, the app would try to retrieve manifest.json from GET https://${domain}/manifest.json.

Start the server

Append your valid Platform access token to the end of the start command

  yarn start <access_token>

Steps

  1. Have your QR Code presentation of a VC ready. You can obtain that using Mattr Wallet when the offline-credential feature is enabled and your phone is offline. Then open your desired credential and press the Present button at the bottom. If you want to produce the QR code in a different application, you need to know that a VC should be first presented in CBOR-LD format, then compressed using gzip, then encoded in base32 and finally the result should be displayed as a QR code. An example QR code presentation can be found at localhost:3000/qr.
  2. Open lcoalhost:3000
  3. Press Scan
  4. Show your QR to the camera. tip: For a successful scan the lighting is important. Also make sure the code is close enough to the camera so the camera box in your browser is almost covered with the QR code image.