> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validationcloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# isBlockhashValid

Returns whether a blockhash is still valid or not.

This method will use `30` [Compute Units](/nodeapi/about/billing).

***

## **Parameters**

* `blockhash` string *<span style={{color: "red"}}>Required</span>.* The hash of the block encoded as base-58 string.
* `object` *optional.* Configuration object containing the following fields:
  * `commitment` string. The level of commitment required for the query. The options include:
    * `finalized` string. The node will query the most recent block confirmed by the supermajority of the cluster as having reached maximum lockout, meaning the cluster has recognized this block as finalized.
    * `confirmed` string. The node will query the most recent block that has been voted on by the supermajority of the cluster.
    * `processed` string. The node will query its most recent block. Note that the block may not be complete.
  * `minContextSlot` integer. The minimum slot at which the request can be evaluated.

## Returns

`result` True if the blockhash is still valid otherwise false.

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "slot": 2483
    },
    "value": false
  },
  "id": 1
}
```

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.solana.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '
      {
        "id":45,
        "jsonrpc":"2.0",
        "method":"isBlockhashValid",
        "params":[
          "ENTER_BLOCKHASH_ID_HERE",
          {"commitment":"processed"}
        ]
      }
  '
  ```

  ```bash title="devnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://devnet.solana.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '
      {
        "id":45,
        "jsonrpc":"2.0",
        "method":"isBlockhashValid",
        "params":[
          "ENTER_BLOCKHASH_ID_HERE",
          {"commitment":"processed"}
        ]
      }
  '
  ```
</CodeGroup>


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