# Purchased Space

The space currently purchased by users across the entire network.

```rust
/// Retrieve Total Purchased Space
///
/// This function retrieves the total amount of space currently purchased by users across the entire network.
/// It allows querying the purchased space information at a specified block hash or the latest block.
///
/// # Parameters
///
/// - `block_hash`: An optional parameter specifying the block hash at which to perform the query. If `None`, the latest block is used.
///
/// # Returns
///
/// Returns a `Result` that, on success, contains an `Option<u128>`:
/// - `Some(u128)`: The total amount of space currently purchased by users across the network, in bytes.
/// - `None`: If no purchased space information is available for the specified block hash.
///
pub async fn purchased_space(
    block_hash: Option<H256>,
) -> Result<Option<u128>, Box<dyn std::error::Error>>
```


---

# 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://doc.cess.network/developer/cess-sdk/sdk-rust/chain/storage_handler/purchased_space.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.