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.NET

MATTR ASP.NET Core Zero Knowledge Proof BBS+

Blogs

Test run the applications

VaccineCredentialsIssuer (OIDC Credential Issuer)

  • Get an account from MATTR (see MATTR docs)
  • Add the secrets to your configuration
  • Initialize your database
  • Install a MATTR Wallet on your phone
  • start application

Verify vaccine

  • Install ngrok for the verifier application (npm)
  • Add the secrets to your configuration
  • Initialize your database
  • Start application using for example http://localhost:5000
  • Start ngrok using ngrok http http://localhost:5000 (like above)
  • Copy the DID for the OIDC Issuer Credentials from the VaccineCredentialsIssuer UI
  • Create a presentation template in the VaccineVerify (Use copied DID)
  • Verify using the wallet and the application

secrets

{
  // use user secrets
  "ConnectionStrings": {
    "DefaultConnection": "--your-connection-string--"
  },
  "MattrConfiguration": {
    "Audience": "https://vii.mattr.global",
    "ClientId": "--your-client-id--",
    "ClientSecret": "--your-client-secret--",
    "TenantId": "--your-tenant--",
    "TenantSubdomain": "--your-tenant-sub-domain--",
    "Url": "http://mattr-prod.au.auth0.com/oauth/token"
  },
  "Auth0": {
    "Domain": "--your-auth0-domain",
    "ClientId": "--your--auth0-client-id--",
    "ClientSecret": "--your-auth0-client-secret--",
  }
  "Auth0Wallet": {
    "Domain": "--your-auth0-wallet-domain",
    "ClientId": "--your--auth0-wallet-client-id--",
    "ClientSecret": "--your-auth0-wallet-client-secret--",
  }
}

"family_name": "",
"given_name": "",
"date_of_birth": "",
// Pfizer/BioNTech Comirnaty EU/1/20/1528 , COVID-19 Vaccine Moderna EU/1/20/1507, Sputnik-V
"medicinal_product_code": "Pfizer/BioNTech Comirnaty EU/1/20/1528",  
"number_of_doses": "2",
"total_number_of_doses": "2",
"vaccination_date": "2021-05-12",
"country_of_vaccination": "CH",

History

2021-12-07 Updated MATTR verify API

2021-12-04 Updated .NET 6

2021-09-25 Updated packages

2021-05-09 Updated packages, code clean up, improved random

Creating Migrations

Console

dotnet ef migrations add vaccine_vc_issuer_init

Powershell

Add-Migration "vaccine_vc_issuer_init"

Running Migrations

Console

dotnet restore

dotnet ef database update --context VaccineCredentialsIssuerMattrContext

Powershell

Update-Database

Links

https://w3c.github.io/json-ld-framing/

https://github.com/admin-ch/CovidCertificate-Apidoc

https://mattr.global/

https://mattr.global/get-started/

https://learn.mattr.global/

https://keybase.io/

https://www.youtube.com/watch?v=2_TDN-81ytM

https://learn.mattr.global/tutorials/dids/did-key

https://gunnarpeipman.com/httpclient-remove-charset/

https://www.lfph.io/wp-content/uploads/2021/02/Verifiable-Credentials-Flavors-Explained.pdf

https://www.xtseminars.co.uk/post/introduction-to-the-future-of-identity-dids-vcs

https://medium.com/decentralized-identity/where-to-begin-with-oidc-and-siop-7dd186c89796

https://www.evernym.com/blog/zero-knowledge-proofs/

https://www.lfph.io/wp-content/uploads/2021/02/Verifiable-Credentials-Flavors-Explained.pdf

https://anonyome.com/2020/06/decentralized-identity-key-concepts-explained/

Mattr.Global instructions

In order to obtain a Credential on the mobile wallet you will need to use the OIDC Bridge, so try following this tutorial.

https://learn.mattr.global/tutorials/issue/oidc-bridge/issue-oidc

At the end of the tutorial you will have a client-bound Credential stored on the mobile wallet. You can then move to Verify a Credential tutorials, first setup a Presentation Template:

https://learn.mattr.global/tutorials/verify/presentation-request-template

Then you can setup your tenant to run the Verify flow, a quick way of doing that is to use a Sample App to orchestrate a number of steps:

https://learn.mattr.global/tutorials/verify/using-callback/callback-intro

Note: because you just have the 1 sandbox tenant, you will be issuing credentials and verifying them through the same instance, but Issuer and Verifier could easily be separate tenants on our platform or indeed any other interoperable platform.

Verifing a credential

https://learn.mattr.global/tutorials/verify/using-callback/callback-local

ngrok http http://localhost:5000

https://learn.mattr.global/tutorials/verify/using-callback/callback-e-to-e