Sign a Compact Credential

Introduction

This guide will demonstrate how to create a compact credential using MATTR VII, these credentials use a flat data structure for compactness, and the credential is then signed using a P-256 signing key that is attached to a DID Web.

If you want a more open data model then look at the Sign a Semantic Compact Credential tutorial. 

Prerequisites

You need the following in order to proceed with this tutorial: 

If you’re experiencing any difficulties, contact us

Create a Web DID 

A web DID (iss) is required when issuing a compact credential. This can be achieved by using the following API with keyType "P-256" in the request payload.

Request

http
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1POST https://YOUR_TENANT_SUBDOMAIN.vii.mattr.global/core/v1/dids
json
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1{
2  "method": "web",
3  "options": {
4    "url": "example.nz",
5    "keyType": "P-256"
6  }
7}

The created DID will then need to be hosted on the path specified in the url option.

Sign a Credential 

Request

http
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1POST https://YOUR_TENANT_SUBDOMAIN.vii.mattr.global/core/v2/credentials/compact/sign
json
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1{
2  "payload": {
3    "iss": "did:web:example.nz",
4    "nbf": 1516239022,
5    "exp": 2516239922,
6    "name": "Emma Jane Tasma",
7    "code": "HS.278",
8    "certificationName": "Working at Heights",
9    "certificationLevel": "Level 4",
10    "issuerName": "Advanced Safety Training",
11    "expiry": "2026-01-01"
12    },
13  "revocable": true
14}

A separate option can be provided to specify if the credential should be revocable. If this Boolean (true/false) value is not provided, it is set to false by default. Learn more about how to revoke a credential here.

Response 

json
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1{
2  "id": "M2Cbq-3GRgu3aXR9YmMHcA",
3  "decoded": {
4    "iss": "did:web:example.nz",
5    "exp": 2516239922,
6    "nbf": 1516239022,
7    "name": "Emma Jane Tasma",
8    "code": "HS.278",
9    "certificationName": "Working at Heights",
10    "certificationLevel": "Level 4",
11    "issuerName": "Advanced Safety Training",
12    "expiry": "2026-01-01",
13    "status": {
14      "index": 604,
15      "url": "https://YOUR_TENANT_SUBDOMAIN.vii.mattr.global/core/v2/credentials/compact/revocation-lists/c0bcfc20-1514-4899-a451-93bccf9a77a9"
16    },
17    "jti": "M2Cbq-3GRgu3aXR9YmMHcA"
18  },
19  "encoded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
20}

The returned payload will contain: 

  • An id to represent the credential, this is required when revoking a credential via the MATTR VII API. 

  • A base32 encoded credential. The encoded string representation of a compact credential is CSC:/1/[base32-encoded-cwt]where CSC stands for COSE_SIGN Compact profile. 

  • The decoded version of the credential will contain a status object that provides the URL and index for where the credentials revocation status if applied, is represented. 

  • status object that provides the URL and index for where the credentials revocation status, if applied, is represented.