# isBlockhashValid

> import Tabs from '@theme/Tabs'
import TabItem from '@theme/TabItem'
import CreditCost from '@site/src/components/CreditCost/CreditCostPrice.js'

# `isBlockhashValid`

Returns whether a block hash is still valid. <CreditCost network="solana" method="isBlockhashValid" />

## Parameters

- `blockhash`: (string) _[requiredl]_ - The `base58` encoded hash of the block.
- `config`: (object) _[optional]_ - Configuration object with the following options:
  - `commitment`: (string) _[optional]_ - The commitment level to use for the query. The default is `finalized`. Possible values are:
    - `finalized` - Queries the most recent block confirmed by a super majority of the cluster as having
      reached maximum lockout, meaning the cluster has recognized this block as finalized.
    - `confirmed` - Queries the most recent block that has been voted on by a super majority of the cluster.
    - `processed` - Queries its most recent block. The block may still be skipped by the cluster.
  - `epoch`: (integer) _[optional]_ - The epoch for which to query the rewards. If not specified, the current epoch is used.
  - `minContextSlot`: _[optional]_ - The minimum slot to use for the query.

## Returns

`result` - `true` if the block hash is still valid; otherwise `false`.

### Request

<Tabs>
  <TabItem value="curl">

```bash
curl https://solana-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0", "id":1, "method":"isBlockhashValid", "params":["4JsC66MuiW8EbromjB3h64NmZQAH24rAWxwK5raQFTt9", {"commitment":"processed"}]}'
```

  </TabItem>
</Tabs>

### Response

<Tabs>
  <TabItem value="JSON">

```bash
{
  "jsonrpc":"2.0",
  "result": {
    "context": {
      "apiVersion":"2.1.16",
      "slot":333329792
    },
    "value":false
  },
  "id":1
}
```

  </TabItem>
</Tabs>