# Building and returning

### BUILDING AND RETURNING A TRUSTCHAIN

{% hint style="info" %}
**Note: This API is obsolete and will be deprecated in future releases. We would recommend to use policy based controlled API through policy configurator.**
{% endhint %}

## Returns a trustchain for a VP document

<mark style="color:blue;">`GET`</mark> `/trust-chains/{hash}`

Builds and returns a trustchain, from the VP to the root VC document. Only users with the Auditor role are allowed to make the request.

#### Path Parameters

| Name                                   | Type   | Description                 |
| -------------------------------------- | ------ | --------------------------- |
| hash<mark style="color:red;">\*</mark> | String | Hash or ID of a VP document |

{% tabs %}
{% tab title="200: OK " %}

```javascript
{
    content:
            application/json:
              schema:
                $ref: '#/components/schemas/TrustChains'
}
```

{% endtab %}

{% tab title="401: Unauthorized " %}

```javascript
{
    // Response
}
```

{% endtab %}

{% tab title="403: Forbidden " %}

```javascript
{
    // Response
}
```

{% endtab %}

{% tab title="500: Internal Server Error Internal Server Error" %}

```javascript
{
    content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
}
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guardian.hedera.com/guardian-dev/guardian/standard-registry/trustchain/trustchain-apis/building-and-returning.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.