Setup DID Resolver

Resolving did:cheqd using our DID Resolver

This page describes how to use and set up the cheqd DID Resolver software package.

If you do not want to install anything and just want to resolve a did:cheqd entry from the ledger, you can load the REST API endpoint for resolver.cheqd.net in your browser.

Or, make a request from terminal to this hosted REST API:

curl -X GET https://resolver.cheqd.net/1.0/identifiers/did:cheqd:testnet:55dbc8bf-fba3-4117-855c-1e0dc1d3bb47

Running your own cheqd DID Resolver using Docker

Spinning up a Docker container from the pre-built did-resolver Docker image on Github is as simple as the command below:

docker compose -f docker/docker-compose.yml up --detach

Configure resolver settings

To configure the resolver, modify the values under the environment section of the Docker Compose file. The values that can be edited are as follows:

1. MAINNET_ENDPOINT : Mainnet Network endpoint as string with the following format" <networks>,<useTls>,<timeout>. Example: grpc.cheqd.net:443,true,5s

   1. networks: A string specifying the Cosmos SDK gRPC endpoint from which the Resolver pulls data. Format: <resource_url>:<resource_port>

   2. useTls: Specify whether gRPC connection to ledger should use secure or insecure pulls. Default is true since gRPC uses HTTP/2 with TLS as the transport mechanism.

   3. timeout: Timeout (in seconds) to wait for before any ledger requests are considered to have time out.

2. TESTNET_ENDPOINT : Testnet Network endpoint as string with the following format" <networks>,<useTls>,<timeout>. Example: grpc.cheqd.network:443,true,5s

3. RESOLVER_LISTENER`: A string with address and port where the resolver listens for requests from clients.

4. LOG_LEVEL: debug/warn/info/error - to define the application log level.

gRPC Endpoints used by DID Resolver

Our DID Resolver uses the Cosmos gRPC endpoint from cheqd-node to fetch data. Typically, this would be running on port 9090 on a cheqd-node instance.

You can either use public gRPC endpoints for the cheqd network (such as the default ones mentioned above), or point it to your own cheqd-node instance by enabling gRPC in the app.toml configuration file on a node:

###############################################################################
###                           gRPC Configuration                            ###
###############################################################################

[grpc]

# Enable defines if the gRPC server should be enabled.
enable = true

# Address defines the gRPC server address to bind to.
address = "0.0.0.0:9090"

Note: If you're pointing a DID Resolver to your own node instance, by default cheqd-node instance gRPC endpoints are not served up with a TLS certificate. This means the useTls property would need to be set to false, unless you're otherwise using a load balancer that provides TLS connections to the gRPC port.

Building your own Docker image

Using Docker Build

You can build your own image using docker build

docker build --file docker/Dockerfile --target resolver . --tag did-resolver:local

Using Docker Compose Build

Uncomment the build section in the docker/docker-compose.yml file. This relies on the Dockerfile above but uses Docker Compose syntax to customise the build:

build:
  context: ../
  dockerfile: docker/Dockerfile
  target: resolver
image: did-resolver:local
# image: ghcr.io/cheqd/did-resolver:${IMAGE_VERSION}

Make sure you comment out the pre-existing image property that pulls in a container image from Github Container Registry, as shown above.

You can also do just a build with:

docker-compose -f docker/docker-compose.yml --env-file docker/docker-compose.env build --no-cache

Running a custom built image

The instructions to configure and run the resolver are the same as when using the pre-built image.

Resolving did:cheqd via Universal Resolver

The resolver.cheqd.net API endpoint is run by the cheqd team and only handles did:cheqd credentials.

If you want to resolve DIDs from multiple DID methods, the Universal Resolver project provides a multi DID method resolver.

Using a pre-existing Universal Resolver endpoint

You can make resolution requests to a pre-existing Universal Resolver endpoint, such as dev.uniresolver.io, to their REST API endpoint:

curl -X GET https://resolver.cheqd.net/1.0/identifiers/did:cheqd:testnet:55dbc8bf-fba3-4117-855c-1e0dc1d3bb47

Running your own Universal Resolver instance

You can also run your own instance of Universal Resolver, using the Docker Compose file of the project.

The Universal Resolver quick start guide provides instructions on how to do this:

git clone https://github.com/decentralized-identity/universal-resolver
cd universal-resolver/
docker-compose -f docker-compose.yml pull
docker-compose -f docker-compose.yml up