> ## 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.

# getLatestBlockhash

Returns the latest blockhash.

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

***

## **Parameters**

* `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` The RpcResponse JSON object with the following fields:

* `context` The information about the current state of the program.
  * `apiVersion` The version of the Solana RPC API to use.
  * `slot` An integer representing the slot for which to retrieve the fee calculator.
* `value` A JSON object with the following fields:
  * `blockhash` The block hash encoded as base-58 string.
  * `lastValidBlockHeight` The last block height at which the blockhash will be valid.

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
	"jsonrpc": "2.0",
	"result": {
		"context": {
			"apiVersion": "2.1.11",
			"slot": 320148671
		},
		"value": {
			"blockhash": "HBVZtYyJnpeWNo3uDL5RfqAjdu5TWrRTcmaVk7sUDc2C",
			"lastValidBlockHeight": 298423682
		}
	},
	"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 '{"jsonrpc":"2.0","id":1, "method":"getLatestBlockhash", "params": [{"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 '{"jsonrpc":"2.0","id":1, "method":"getLatestBlockhash", "params": [{"commitment":"processed"}]}'
      
  ```
</CodeGroup>


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