[OpenID-Specs-eKYC-IDA] Issue #1299: Attachments should include a txn (openid/ekyc-ida)

[Julian White]

New issue 1299: Attachments should include a txn
https://bitbucket.org/openid/ekyc-ida/issues/1299/attachments-should-include-a-txn

Julian White:

It would be useful if attachments could include a txn so that where there are multiple attachments its easy to automatically link them to specific steps or parts of the assurance process.

For example, where an image of someone’s ID card and their face needs to be included in the response they could each be linked to the different `check_methods` by their respective txn. The current specification enables you to do this via the `desc` as a description, but that needs human interpretation, adding a `txn` as an option would make that easily computable.

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```
{
  "verified_claims": {
    "verification": {
      "trust_framework":"eidas",
      "assurance_level": "substantial",
      "evidence": [
        {
          "type": "document",
          "check_details": [
            {
              "check_method": "vri",
              "organization": "doc_checker",
              "txn": "ID1-93h506th2f45hf"
            },
            {
              "check_method": "bvp",
              "organization": "face_checker",
              "txn": "v-93jfk284ugjfj2093"
            }
          ],
          "time": "2012-04-22T11:30Z",
          "document_details": {
            "type": "idcard",
            "issuer": {
              "name": "Stadt Augsburg",
              "country": "DE"
            },
            "document_number": "53554554",
            "date_of_issuance": "2010-03-23",
            "date_of_expiry": "2020-03-22"
          },
          "attachments": [
            {
              "desc": "Front of id document",
              "content_type": "image/png",
              "txn": "ID1-93h506th2f45hf",
              "content": "Wkd0bWFtVnlhWFI2Wlc0Mk16VER2RFUyY0RRMWFUbDBNelJ1TlRjd31dzdaM1pTQXJaWGRsTXpNZ2RETmxDZwo="
            },
            {
              "desc": "selfie of user",
              "content_type": "image/png",
              "txn": "v-93jfk284ugjfj2093",
              "content": "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAADSFsjdkhjwhAABJRU5ErkJggg=="
            }
          ]
        }
      ]
    },
    "claims": {
      "given_name": "Max",
      "family_name": "Mustermann",
      "birthdate": "1956-01-28"
    }
  }
}
```

‌