VPQR

Converting QR codes into Verifiable Presentations <> Verifiable Presentations into QR codes.

Overview

When interacting with Verifiable Presentations, it is often useful to use QR codes.

For converting VPs to QRs, and vice versa, LearnCard leverages an open-source library from Digital Bazaar, VPQR:

An isomorphic JS (for Node.js and browser) library that takes a Verifiable Presentation, compresses it via CBOR-LD, and turns it into a QR Code.

There are several advantages to the VPQR approach:

  • Base-64 Image: for locally generated, transient QR codes.

  • CBOR-LD Compression: because VPs are JSON-LD, they can often be bloated with context files; VPQR handles compressing/expanding JSON-LD files for minimal QR data footprint.

Installation

pnpm i @learncard/vpqr-plugin

Use Cases

There are many use cases for converting between VPs & QR codes.

  • Issuing a Verifiable Credential to a subject: for example, check out the LearnCard Discord Bot, which sends a QR code as an attachment to an issued credential in a Discord message, allowing receivers to scan and claim the credential from any interoperable wallet.

  • //TODO: more examples

How to Convert a Verifiable Presentation into a QR code:

    /**
     * Returns a QR-embeddable data string from a VP
     */
    VPtoQrCode: (vp: VP) => Promise<string>;
const vp = await learnCard.getTestVp();

Then, generate a QR code of the VP:

const qrImage = await learnCard.VPtoQrCode(vp);
// qrImage = 'data:image/gif;base64,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'

New to Base64 images? Learn more here.

Then, the qrImage can be embedded in HTML like so:

<img src="data:image/gif;base64,R0lGODdhqgCqAIAAAAAAAP///ywAAAAAqgCqAAAC/4yPqcvtD6OctNqLs968+w+G4kiW5omm6sq27gvH8kzX9u0C+s7zhv4DIIALIjHYSwoDyaBFuTRGd8Oe83BMQJuTrZU5rTKkVa/UB34qr+clkprGurXmLMROf9ez/Dl7DdY3ZlYWFvhVyEXWgOfQKKe3JwaZd4iGdqVQV/jHlfi1OEjRthhKqTnXFrkZd4lYSUp4CjvlOloLV+oXhzrpupeLGynaCpy6+zfMGxGbzBj8+KaceTiJqiqHWV0pTdm8fIer6wiNnC1+zDmrru25bf1erBxdhE7t7At3vdWJ/r1aTpcxUPbAPfiGx1S/QV4WWgp4DMo8f8b6KTxoDh+taf8Pe62j88tQQkDU3HWD51ECvYvO3JlctpLgOJCv+mg7+RElRlYze4r82RKovKE+gxotxkqlJKJCizI96jRq06kW+Z2wBbPgyJFBTd3MSixsPBpYBXU0+NWnV32zHsVUJ6JdzYxIhZ1Luu2lTav3zm5lG4vevk8682EDKPEcx5Ky+ira5ZLiLbh3hab8iFWnXIQQOQ+uN1Mp5Yl9HUMOdhlnSGyJH3/+zPLZvq9H4XGluXftbLtVAwOKPRk323ymNZ/ejBqzzHQPfbs2qIbY4Y3e+NblvDr53tLXeVcWXE+6d+LVE1edmD10XnPYj7+KPrTbbcLxhauOaOiTc8D4DY//r6BeZsqVxd5ytiWnH0VyUcbacADaFRJ37bUnlnza0TXfM60h+KCFDYqXHXoFwnYhOamB9huHSj0mkHsskqQcQA691t1+EjoI3m4fjtVcZzieJmNdDDG34YZDnhiORowtGE+EaJWIokN/uXXhPxuotyR/9+3ITn40SeligS0ulsGLIqZXDo3nZUUlk102VKODajj5IprT4bTmdiia9aZVNl75H3CVMcgflWTWiZ9aKfapwZ31DannliOeRV9kBCLmpZNzuodnTsLdZuaXT1E6qGKmEvpSOH91yl2CHoXaZVc/IjdakzCCgFdx1NVW3o+6tmjnez2SkOuTrxLp5Zrk/5HnG6Zp3doFhCnC6ayBQrIpLa2nxpkgnXSBKFmPyPFUZaZpkqptb4lOmywzwmqULjfQPfrdXMwW2q6S3WGQan3xHigepDCaNZ2Ay/aa457nPldhW7P6aKioHAFjYqmbemuwvAdOqeCkqOJLbXgWR2thpVquJ6tpAu6Y208rW5uhaCiXyuSl13LMWMnYAmuut0i6W63JfH66KL05iwskUy3jRRtGQdN8so5Fx0awdVCBvBSrO7X7bJuWORyZh4F2LDDDYH8b5ZOrpn3R0sg2CKrV9WYcqbs2eyabqY7y+iy8zIkt1d4aQom3WARGvFbcR2dJmtL/qSosuVW3ja+6/v/9nGSMtCQstdSa3syp3uHO6Gnmul7+4EBhQ/10gEmrC6fX4w6MtucVnc3zc7rJu5+RCrvt5gXmiRwz0Y62vLjEaldenaSNQntwq0h3ijxYaavMfMrb8uvnurp//bHbYFIuOddRl9l9t4Tna+vsY86svs/Kc66538lbmnTXf6NLkH9NA/8up/HOXPebS9zWlqXqTS6AAGwaOao3vjCR6URmk5139FQ1wMlpa/SJ4G4mqDG/7E9o+3tZBB04OK2Z8GyMIpq+/Pc2su1LdNIjkdcK+DHqTQ1DBTlh//iHpdRZp2/YSqAEHdesa6kQWTqkX9kMmL/+7OyIPAtSwTaYQR7/oTBzEJwXpo7kLyj+a3vLg9sRuWfEwsxNTF/D3xh1+MH14Ex4vmKdHKHIOG4ZDXc/jJ6ohnaLDH0viTrTme/essZf8XB3wRGcISFyNRuycWMlrOPnLkO/94HRjFKRJBjzCMpeaS15gdQKzE75J9NtjoBAZN8gN1jKM2VrYRCr3by4NMNC2ieXHRqZGSemIutBrnOi9KW1XuhFkQFTbMCknBrVNKxiNvNcyHQi6I6lvnttkn2NO1rwPodBW4JLkdls3i2hJDAc2qqFebQmM+uVJ26GEFbUqZnLFinFFa7ogju0mSpFFLB1Ou6B+eSQO3eZsVCCiZjY5KDDsOdMMnJP/36YtGQwh+dHGmXRZBW1ZvHu01A/LjBEA0WYtBYqwn417IaaU9wArfjDKwK0pBOCJds6NrzvfRGeA4zJ0F4Z0rzFMk4h0+n0eEpJglJSk+asGHyC11Es2uul8+uZ93ioTWMlc5ylm2I667e8g7kPq+aMqEdvZ8TcpY9UsSIqu2J3z0OKc42rg2m1DidVRZUPrrBDJ9DI6NJnlvF1qzzeutrJyqzKDI676uoc1UihnhrUry496yMtCE7wgQ6Bo9LL2PQawIrh9YkypdcvqyqrA4ZOrZnsYTFXFzLEDhOw3fMdNGMrQM9qEIZE1OUntVjbot1WbjKDa+LQxjS/ajCnlf+UpHFtKtrgKvR3eDRtLb85wjs+96AWNE5bXVVYVJ4PUZdUZlN7GcfTwQ+pJsXYeJdDz5XKc5vMDdXLyqvAWjYOtIvtKn1pZ9/J4vew2oUvVXjpVP9u7YoMlpui+DY6Hi33pCblAD0zi9sHj8pyEi0wLq3U30OdD7wUVTDAlHdi8sU1tOYVMSB5WuIaUrVW3jQfa+f6zj4ZtVZzbLA9WbZirm7xpmvja1jnGVOsLfCRylrlKAeXxPf5U2F2BatPr5pVRF4sXFJWLkKFq1XpjTXLZH2qgfEX1eMaB83tm0rE/KbS3J65uku16pqrqy2mphjL6Pspl9cHQkHa9Lj/w1r/Q4c82xoHOLUeY2HexHc9tpYUPscyLEkxO0vDNbfCr82eiUPowS8nNJrlVaeiT4Zhwjayn8Hk6LYKDVsK/2l2QZVxpZM86m62+Yn3Am2qA/vpfwrTw22kHQynSegwxatuz6uojilrbE670aocW7YUg/PdlkoVpnhVs5P/eMYwxlm+EUXdrS9tSh5/1sao5vM+42xP++2ahsD1NhGthGgJQ5nF8Q6j8+itP8RWls4O7W+GYyjiEEua1p3msOtsLVnddrq3Auzgq6d6tx3WeFN11igr61a8LrdV5NYDOY4F6mImnheqWv0woGe2UZSjd+HQ82o0ddlJUJ9Tw9qjNM37/5VfNmcxiG8GN+n0jL5bZ7thCUb3RB82ZEg3+9u+bXHFCwzx9LJX0+OmbhqJfdeaP9d2AW3yTvNNzKD/WXVsjO9Rgwrio6KdjrLs9mofFlDVRhLr4D4oF+dcxb6H7tBRzDlJ2Wm3xgD8ui8vreMfN+kidnauFDM6sY3K1MzfM+/vzbnCeUvNR0cRpFam4p+ZLHhsE0+6cia8n5395SpPOcd/xTyuC09csC+YgXVMa7RXnfHRhhfoPoIc8QUdvxHXvo/XnDzFfTx6yQd8wzOcezxRF7jeK5HmcF43hGcK/Mky2rOItLTiR876pJ737yu8MWddr2yxl8vtJs96MndXeV91xr3XS3klIaV/cuUXQ0W1aftXVrfjfxEWTltmW9vHdYTFcjcicRIYZAgWLeRibkIFXITCdDf3UDe1XyyGAyNIgiVogieIgimogivIgi3ogi8IgzEogzNIgzVogypYAAA7" 
    alt="Test VP Embedded in QR Code" />

If you scan the QR code, you will get the following text:

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

Check out the next section for decoding this back into a Verifiable Presentation!

How to Retrieve a Verifiable Presentation from a QR code:

    /**
     * Returns a VP from a QR code string.
     */
    VPfromQrCode: (text: string) => Promise<VP>;

If you followed the steps in the previous section, to generate a QR code from a Verifiable Presentation, you should be able to scan a QR code and read a string like this:

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

Open up the learn-card-cli , and let's decode the Verifiable Presentation:

const qrText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
await learnCard.VPfromQrCode(qrText)
/**
{
  '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
  type: [ 'VerifiablePresentation' ],
  holder: 'did:key:z6MkvDE4XTatmwifvA8pUiVsqEHrqfVCGM4WG4nXbrJ5ijVp',
  verifiableCredential: {
    '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
    type: [ 'VerifiableCredential' ],
    credentialSubject: { id: 'did:example:d23dd687a7dc6787646f2eb98d0' },
    id: 'http://example.org/credentials/3731',
    issuanceDate: '2020-08-19T21:41:50Z',
    issuer: 'did:key:z6MkvDE4XTatmwifvA8pUiVsqEHrqfVCGM4WG4nXbrJ5ijVp',
    proof: {
      type: 'Ed25519Signature2018',
      created: '2022-08-22T21:28:14.661Z',
      jws: 'eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..wIz73ib3SlVXhNqh6UsyFb-anGf87tpEMz6Pm1WtE47PTbwWiaJTdV6NunHeieqZOE4I-1FJ32pADGGnydCqAg',
      proofPurpose: 'assertionMethod',
      verificationMethod: 'did:key:z6MkvDE4XTatmwifvA8pUiVsqEHrqfVCGM4WG4nXbrJ5ijVp#z6MkvDE4XTatmwifvA8pUiVsqEHrqfVCGM4WG4nXbrJ5ijVp'
    }
  }
}
*/
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