> For the complete documentation index, see [llms.txt](https://docs.triton.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.triton.one/solana/rpc-methods/utility-methods/isblockhashvalid.md).

# isBlockhashValid

Returns a boolean for whether a blockhash is still valid for transaction processing at the requested commitment.

## Request

{% tabs %}
{% tab title="cURL" %}

```bash
curl "https://<your-endpoint>.mainnet.rpcpool.com/<your-token>" -s -X POST \
  -H "Content-Type: application/json" \
  -d '{
  "jsonrpc": "2.0",
  "id": 45,
  "method": "isBlockhashValid",
  "params": [
    "J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW",
    {
      "commitment": "processed"
    }
  ]
}'
```

{% endtab %}

{% tab title="Kit" %}

```typescript
import { createSolanaRpc, type Blockhash } from "@solana/kit";

const rpc_url = "https://<your-endpoint>.mainnet.rpcpool.com/<your-token>";
const rpc = createSolanaRpc(rpc_url);

let blockhash = "J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW";

let isValid = await rpc.isBlockhashValid(blockhash as Blockhash).send();

console.log(isValid);
```

{% endtab %}

{% tab title="web3.js" %}

```typescript
import { Connection } from "@solana/web3.js";

const connection = new Connection("https://<your-endpoint>.mainnet.rpcpool.com/<your-token>", "confirmed");

let blockhash = "J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW";

let isValid = await connection.isBlockhashValid(blockhash);

console.log(isValid);
```

{% endtab %}

{% tab title="Rust" %}

```rust
// Cargo.toml: anyhow = "1", solana-client = "~4.4", solana-commitment-config = "3",
// solana-sdk = "5", tokio = { version = "1", features = ["full"] }. solana-client 4.4 takes
// solana-sdk 5.x types. Requires Rust 1.98.1 or newer (solana-client 4.4).
use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_commitment_config::CommitmentConfig;
use solana_sdk::hash::Hash;
use std::str::FromStr;

#[tokio::main]
async fn main() -> Result<()> {
    let client = RpcClient::new_with_commitment(
        String::from("https://<your-endpoint>.mainnet.rpcpool.com/<your-token>"),
        CommitmentConfig::confirmed(),
    );

    let blockhash = Hash::from_str("J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW")?;

    let is_valid = client
        .is_blockhash_valid(&blockhash, CommitmentConfig::finalized())
        .await?;

    println!("{:#?}", is_valid);

    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Parameters

**`blockhash`** · string · required

The blockhash of the block to evaluate, as base-58 encoded string

**`config`** · object

Configuration object containing the following fields:

**`commitment`** · string · default `finalized`

Values: `processed`, `confirmed`, `finalized`

Solana RPC uses the following commitment levels:

| Value       | Description                                                                                                                                                                        |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `processed` | Return data from the highest slot this node has processed on the fork it currently considers best. This is the newest view, but it can still change if the cluster switches forks. |
| `confirmed` | Return data from the highest slot the cluster has finalized. On Alpenglow, `confirmed` and `finalized` are the same level.                                                         |
| `finalized` | Return data from the highest slot that the cluster has finalized. On Alpenglow there are no vote towers or lockouts: a slot is finalized by certificates of aggregated votes.      |

**`minContextSlot`** · number

The minimum slot that the request can be evaluated at

## Response

```json
{
  "jsonrpc": "2.0",
  "result": {
    "context": { "apiVersion": "4.3.2", "slot": 2483 },
    "value": false
  },
  "id": 45
}
```

## Result

RpcResponse object containing:

**`context`** · object

Slot and API version the node used to answer this request.

| Field        | Type     | Description                                                                     |
| ------------ | -------- | ------------------------------------------------------------------------------- |
| `slot`       | `u64`    | Slot at which the node evaluated this request.                                  |
| `apiVersion` | `string` | RPC API version reported by the node. This field may be omitted by older nodes. |

**`value`** · bool

Whether the blockhash is still valid at the evaluated slot.

***

*Adapted from the* [*Solana `isBlockhashValid` reference*](https://solana.com/docs/rpc/http/isblockhashvalid)*, maintained by the Solana Foundation.*

***

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