LearnCard CLI

LearnCard CLI is an easy to use node REPL that instantiates a Learn Card wallet for you and gives you all the tools you need to easily play around with the Learn Card SDK!

Usage

npx @learncard/cli

# Optionally specify a deterministic seed to instantiate the wallet with
npx @learncard/cli 1b498556081a298261313657c32d5d0a9ce8285dc4d659e6787392207e4a7ac2h

Getting Started

Run npx @learncard/cli to boot up the CLI - you should see this screen in your terminal!

From within the CLI, you should be able to start playing around with a basic learn card wallet. When the CLI boots up, it creates a default LearnCard called wallet that you can interact with.

Basic Usage

View your wallet's DID

One of the easiest ways to interact with your wallet, is to get your wallet's DID:

wallet.did()
// 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6'

wallet.did('pkh:sol');
// 'did:pkh:sol:G4Ky3gTVPE9a54o2DrJsAJW1yVRDHYqCni61MSJv8Dgi'

wallet.did('tz');
// 'did:tz:tz1Y2Rg8ofGpdGpRqHfix3yy4J6qqK19NE5h'

wallet.did('pkh:tz');
// 'did:pkh:tz:tz1Y2Rg8ofGpdGpRqHfix3yy4J6qqK19NE5h'

If your wallet is initialized to support more did methods, such as did:web, you could retrieve the corresponding DID through this function.

Basic Verifiable Credential Issuance & Verification Flow

Once the CLI has booted up, you can start issuing credentials. Try a basic Verifiable Credential issuance and verification flow, for example:

// Create a new, unsigned test Verifiable Credential
const unsignedVerifiableCredential = wallet.getTestVc();
/**
{
  '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
  id: 'http://example.org/credentials/3731',
  type: [ 'VerifiableCredential' ],
  issuer: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
  issuanceDate: '2020-08-19T21:41:50Z',
  credentialSubject: { id: 'did:example:d23dd687a7dc6787646f2eb98d0' }
}
*/

// Then, issue the credential to yourself (i.e. sign the credential to turn it into a verifiable credential)
const signedVerifiableCredential = await wallet.issueCredential(unsignedVerifiableCredential);
/** 
{
  '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
  id: 'http://example.org/credentials/3731',
  type: [ 'VerifiableCredential' ],
  credentialSubject: { id: 'did:example:d23dd687a7dc6787646f2eb98d0' },
  issuer: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
  issuanceDate: '2020-08-19T21:41:50Z',
  proof: {
    type: 'Ed25519Signature2018',
    proofPurpose: 'assertionMethod',
    verificationMethod: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6#z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
    created: '2022-09-30T15:33:51.015Z',
    jws: 'eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..NkaBWEFT2JCU1ZjMSGmbL72EPhVsAsLykAHULee2uh8YdqBqJbti_FmplQQvGnPDy80pbrFRA-IYQQUx11ISCw'
  }
}
**/

// Then, verify the credential! 
// The verifies that the credential is valid, has not been tampered with, and was issued by and to the correct DIDs
await wallet.verifyCredential(signedVerifiableCredential);
/**
[
  { status: 'Success', check: 'proof', message: 'Valid' },
  {
    status: 'Success',
    check: 'expiration',
    message: 'Valid • Does Not Expire'
  }
]
**/

Basic Verifiable Presentation Issuance & Verification Flow

Now, take the signedVerifiableCredential you created in the VC issuance flow above, and try wrapping it into a Verifiable Presentation, and verifying it.

// Get an unsigned, test Verifiable Presentation template containing your signe dVC
const unsignedVerifiablePresentation = await wallet.getTestVp(signedVerifiableCredential);
/**
{
  '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
  type: [ 'VerifiablePresentation' ],
  holder: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
  verifiableCredential: {
    '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
    id: 'http://example.org/credentials/3731',
    type: [ 'VerifiableCredential' ],
    credentialSubject: { id: 'did:example:d23dd687a7dc6787646f2eb98d0' },
    issuer: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
    issuanceDate: '2020-08-19T21:41:50Z',
    proof: {
      type: 'Ed25519Signature2018',
      proofPurpose: 'assertionMethod',
      verificationMethod: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6#z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
      created: '2022-09-30T15:33:51.015Z',
      jws: 'eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..NkaBWEFT2JCU1ZjMSGmbL72EPhVsAsLykAHULee2uh8YdqBqJbti_FmplQQvGnPDy80pbrFRA-IYQQUx11ISCw'
    }
  }
}
**/

// Issue (sign) the Verifiable Presentation 
const verifiablePresentation = await wallet.issuePresentation(unsignedVerifiablePresentation);
/**
{
  '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
  type: [ 'VerifiablePresentation' ],
  verifiableCredential: {
    '@context': [ 'https://www.w3.org/2018/credentials/v1' ],
    id: 'http://example.org/credentials/3731',
    type: [ 'VerifiableCredential' ],
    credentialSubject: { id: 'did:example:d23dd687a7dc6787646f2eb98d0' },
    issuer: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
    issuanceDate: '2020-08-19T21:41:50Z',
    proof: {
      type: 'Ed25519Signature2018',
      proofPurpose: 'assertionMethod',
      verificationMethod: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6#z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
      created: '2022-09-30T15:33:51.015Z',
      jws: 'eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..NkaBWEFT2JCU1ZjMSGmbL72EPhVsAsLykAHULee2uh8YdqBqJbti_FmplQQvGnPDy80pbrFRA-IYQQUx11ISCw'
    }
  },
  proof: {
    type: 'Ed25519Signature2018',
    proofPurpose: 'assertionMethod',
    verificationMethod: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6#z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6',
    created: '2022-09-30T15:41:39.175Z',
    jws: 'eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..iOAHkQiIp5fi9IiuKIxCAnTQ-A7BL8cbCVAF_-pwDr5uvewWHuk1UISoElVSzeDxBO_OjsjDJ4qZeowwZ4WEDA'
  },
  holder: 'did:key:z6MkuWb1dvhvime3BZdiuRGi1Q41o4h4hS5ZUizwBiGw3SU6'
}
**/

// Verify the Verifiable Presentation has not been tampered with.
await wallet.verifyPresentation(verifiablePresentation);
/**
{ checks: [ 'proof' ], warnings: [], errors: [] }
**/

Initialize more LearnCard wallets

At any point, you can initialize additional wallets in the CLI, which can be helpful for testing cross-wallet flows:

// Initialize an empty wallet (can not sign credentials)
const emptyWallet = await initLearnCard();

// Initializes a new wallet with deterministically seeded key material.
const seededWallet = await initLearnCard({ seed: 'abc123' });

Check out docs on initializing LearnCards for more ways to create a wallet.

And beyond!

There is a ton of functionality exposed through the CLI. Explore the Usage Examples in LearnCard Wallet SDK:

Usage Examples