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

# getLatestBlockhash

> Returns the latest Solana blockhash required for constructing fresh transactions. Blockhashes expire after ~150 slots. Fetch one just before signing to maximize the inclusion window.

Returns the latest Solana blockhash required for constructing fresh transactions. Blockhashes expire after \~150 slots. Fetch one just before signing to maximize the inclusion window.

## On ThorNode

Forwarded to the upstream node with a 10 s timeout and one retry on a transport error.

## Parameters

<ParamField body="commitment" type="string">
  The commitment level for the request.

  * `confirmed`
  * `finalized`
  * `processed`
</ParamField>

<ParamField body="minContextSlot" type="number">
  The minimum slot that the request can be evaluated at.
</ParamField>

## Response

<ResponseField name="context" type="object">
  Context of the response.

  <Expandable title="properties">
    <ResponseField name="slot" type="integer">
      The slot at which the data was fetched.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="value" type="object">
  Blockhash and its validity details.

  <Expandable title="properties">
    <ResponseField name="blockhash" type="string">
      The latest Solana blockhash encoded as a base-58 string, required for transaction creation.
    </ResponseField>

    <ResponseField name="lastValidBlockHeight" type="integer">
      The last Solana block height at which this blockhash will be accepted in transactions.
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl --fail-with-body "$THORNODE_RPC_URL" \
    --header 'content-type: application/json' \
    --data '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "getLatestBlockhash",
      "params": [
        {
          "commitment": "processed"
        }
      ]
    }'
  ```

  ```javascript Node.js theme={null}
  const body = {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getLatestBlockhash",
    "params": [
      {
        "commitment": "processed"
      }
    ]
  };

  const response = await fetch(process.env.THORNODE_RPC_URL, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify(body),
  });
  const { result, error } = await response.json();
  console.log(result ?? error);
  ```
</RequestExample>

<ResponseExample>
  ```json Response theme={null}
  {
    "jsonrpc": "2.0",
    "result": {
      "context": {
        "apiVersion": "4.1.2",
        "slot": 439749118
      },
      "value": {
        "blockhash": "DoLUbTY3nUpNK9YvxzYBjvpg6BdmDvqhjCfnzY5yeWU",
        "lastValidBlockHeight": 417799829
      }
    },
    "id": 1
  }
  ```
</ResponseExample>