CredentialRevocation.md

These are the ACA-py steps and APIs involved to support credential revocation.

Run ACA-Py with tails server support enabled. You will need to have the URL of an running instance of https://github.com/bcgov/indy-tails-server.

Incude the command line parameter --tails-server-base-url <indy-tails-server url>

0. Publish credential definition

   Credential definition is created. All required revocation collateral is also created and managed including revocation registry definition, entry, and tails file.

   POST /credential-definitions
   {
     "schema_id": schema_id,
     "support_revocation": true,
     # Only needed if support_revocation is true. Defaults to 100
     "revocation_registry_size": size_int,
     "tag": cred_def_tag # Optional
   
   }
   Response:
   {
     "credential_definition_id": "credential_definition_id"
   }
   

1. Issue credential

   This endpoint manages revocation data. If new revocation registry data is required, it is automatically managed in the background.

   POST /issue-credential/send-offer
   {
       "cred_def_id": credential_definition_id,
       "revoc_reg_id": revocation_registry_id
       "auto_remove": False, # We need the credential exchange record when revoking
       ...
   }
   Response
   {
       "credential_exchange_id": credential_exchange_id
   }
   

2. Revoking credential

   POST /issue-credential/revoke?rev_reg_id=<revocation_registry_id>
        &cred_rev_id=<credential_revocation_id>&publish=<true|false>
   

   If publish=false, you must use ​/issue-credential​/publish-revocations to publish pending revocations in batches. Revocation are not written to ledger until this is called.

3. When asking for proof, specify the timespan when the credential is NOT revoked

    POST /present-proof/send-request
    {
      "connection_id": ...,
      "proof_request": {
        "requested_attributes": [
          {
            "name": ...
            "restrictions": ...,
            ...
            "non_revoked": # Optional, override the global one when specified
            {
              "from": <seconds from Unix Epoch> # Optional, default is 0
              "to": <seconds from Unix Epoch>
            }
          },
          ...
        ],
        "requested_predicates": [
          {
            "name": ...
            ...
            "non_revoked": # Optional, override the global one when specified
            {
              "from": <seconds from Unix Epoch> # Optional, default is 0
              "to": <seconds from Unix Epoch>
            }
          },
          ...
        ],
        "non_revoked": # Optional, only check revocation if specified
        {
          "from": <seconds from Unix Epoch> # Optional, default is 0
          "to": <seconds from Unix Epoch>
        }
      }
    }