# Challenge Process

The Challenge Process begins when **Validating Nodes (VNs)** detect a discrepancy in the transaction processing.

<figure><img src="/files/aFsTukyOzlZ4zXrsEe7B" alt=""><figcaption><p>Challenge Process</p></figcaption></figure>

**These discrepancies can arise from various issues, such as:**

* A mismatch between **off-chain orders** processed by the sequencer and their corresponding **on-chain orders**.
* Off-chain orders being processed **out of sequence** by the sequencer (e.g., an order that should have been processed first was handled later).
* **Exclusion** of an order from the blockchain entirely by the sequencer, even though it was a valid order that was processed **on-chain**.

{% hint style="info" %}
When VNs detect one of these problems, they can trigger a **challenge**.
{% endhint %}

<figure><img src="/files/QqxD8wcfrwnB2fzeBAWS" alt=""><figcaption><p>Challenge Process Flow</p></figcaption></figure>


---

# 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.yamata.io/yamata-nodes/order-validation/challenge-process.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.