# Presentations

[Credential verification](/truvera-workspace/verify-credentials.md) consists of [defining a verification template / proof template](/truvera-api/presentations/proof-templates.md), using it to generate a [proof request](/truvera-api/presentations/proof-requests.md), delivering the proof request to a holder, receiving the proof response from the holder's wallet, and checking that response for consistency. The Truvera API automates many of these steps for you. The REST API does not contain functions to create a verifiable presentation, as that is done through the [Wallet SDK](/credential-wallet/wallet-sdk.md). The open source [Truvera Credential SDK](https://github.com/docknetwork/sdk) also contains the foundational capabilities needed to create proof presentations.

Our system supports the [DIF Presentation Exchange (PEX)](https://identity.foundation/presentation-exchange/) syntax for querying and filtering credentials.

## Examples

These are a few common examples of credential verification. More examples are in the documentation for [DIF Presentation Exchange](https://identity.foundation/presentation-exchange/#input-descriptor-extensions).

#### Require a numeric attribute to be within a range

A verifier might require that the holder have an income between $100,000 and $200,000 per year. This could be requested using the following `input_descriptor`

```
{
  path: ['$.credentialSubject.income.2022.total'],
  filter: {
    type: 'number',
    minimum: 100000,
    maximum: 200000
  },
}
```

#### Require a date attribute to be within a range

A verifier might require that the credential be issued after a certain date. In this example the verifier is requiring that the credential was issued between January 1, 2020 and December 31, 2020.

```
{
  path: ['$.issuanceDate'],
  filter: {
    "type": "string",
    "format": "date",
    "formatMinimum": "2020-01-01",
    "formatMaximum": "2020-12-31"
  },
}
```


---

# 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://docs.truvera.io/truvera-api/presentations.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.