# Using the Subgraph

All the on-chain data is indexed via a subgraph, deployed for all networks and hosted via The Graph.

For example, the Linea mainnet subgraph can be found there:

{% hint style="info" %}
<https://api.studio.thegraph.com/query/67521/verax-v2-linea/v0.0.1>
{% endhint %}

As for the Linea Sepolia subgraph, you can access it here:

{% hint style="info" %}
<https://api.studio.thegraph.com/query/67521/verax-v2-linea-sepolia/v0.0.2>
{% endhint %}

You can also get access to all the subgraphs URLs from the project's [Readme file](https://github.com/Consensys/linea-attestation-registry?tab=readme-ov-file#subgraphs-urls).

You can use this default web interface to write queries in GraphQL to search through the attestation registry. Alternatively, you can use a tool such as Postman, or use the subgraph's API to query the registry directly from your own dApp.

Examples of queries that you can make using the subgraph:

1. Get all attestations, along with the respective schema string, and the decoded attestation data:

   ```graphql
   query MyQuery {
     attestations {
       attestationData
       decodedData
       schemaString
     }
   }
   ```
2. Give me all attestations related issued to a specific address:

   ```graphql
   query MyQuery {
     attestations(where: {subject: "0xd14BF29e486DFC3836757b9B8CCFc95a5160A56D"}) {
       attestationData
       decodedData
       schemaString
     }
   }
   ```
3. Give me all attestations issued to a specific address, related to a specific schema ID, that have not been revoked.

   ```graphql
   query MyQuery {
     attestations(
       where: {
         subject: "0xd14BF29e486DFC3836757b9B8CCFc95a5160A56D",
         schemaId: "0x7b2d17830782df831c39edcbd728a47f0a470d57fdf452b5f4226f467f48295e",
         revoked: false
       }
     ) {
       attestationData
       decodedData
       schemaString
     }
   }
   ```

As well as querying the attestation registry, you can query the schema registry, module registry, and portal registry. For example, if you want to browse the library of existing schemas:

```graphql
query SchemaQuery {
  schemas {
    name
    description
    id
    context
  }
}
```

***

To get more information on using the subgraph, please refer to [The Graph's documentation](https://thegraph.com/docs/en/).

The source code for our subgraph is available [in our monorepo](https://github.com/Consensys/linea-attestation-registry/tree/dev/subgraph), where you find info on deploying your own subgraph if you want to.