# Counted Service Failed

Retrieves the total number of **service failures** recorded for a specific account on the CESS chain.\
This query is part of the **Audit pallet** and helps determine how often a storage miner has failed service verification tasks.

***

## Function Definition

```rust
pub async fn counted_service_failed(
    account: &str,
    block_hash: Option<H256>,
) -> Result<Option<u32>, Error>
```

***

## Description

This asynchronous method queries the CESS blockchain for the count of failed service challenges associated with a specific account. Optionally, a block\_hash can be provided to inspect the state of the chain at a particular block height.

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### Parameters

| Name        | Type   | Description                                                                                    |
| ----------- | ------ | ---------------------------------------------------------------------------------------------- |
| account     | \&str  | A valid SS58-encoded account representing the miner or user to query.                          |
| block\_hash | Option | (Optional) Block hash used to query historical state. If omitted, the latest state is queried. |

***

### Returns

| Type          | Description                                                            |
| ------------- | ---------------------------------------------------------------------- |
| Ok(Some(u32)) | Returns the number of recorded service failures for the given account. |
| Ok(None)      | No record of service failures exists for the account.                  |
| Err(Error)    | The query failed due to invalid parameters or connection issues.       |

## Example

```rust
#[cfg(test)]
use cess_rust_sdk::chain::audit::query::StorageQuery;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let account = "cXgaee2N8E77JJv9gdsGAckv1Qsf3hqWYf7NL4q6ZuQzuAUtB";

    let result = StorageQuery::counted_service_failed(account, None).await?;

    match result {
        Some(count) => println!("Account {} has {} service failures.", account, count),
        None => println!("No service failure record found for account {}.", account),
    }

    Ok(())
}

```