# getblockheader

If verbose is false, returns a string that is serialized, hex-encoded data for blockheader ‘hash’. If verbose is true, returns an Object with information about blockheader ‘hash’.

This method will use `10` [Compute Units](https://docs.validationcloud.io/v1/about/billing).

***

## **Reference:** [**Here**](https://developer.bitcoin.org/reference/rpc/getblockheader.html)

## **Parameters**

**`blockhash`** - string, required

The block hash

**`verbose`** - **boolean, optional, default=true**

true for a json object, false for the hex-encoded data

## Returns (for verbose = true)

```json
{                                 (json object)
  "hash" : "hex",                 (string) the block hash (same as provided)
  "confirmations" : n,            (numeric) The number of confirmations, or -1 if the block is not on the main chain
  "height" : n,                   (numeric) The block height or index
  "version" : n,                  (numeric) The block version
  "versionHex" : "hex",           (string) The block version formatted in hexadecimal
  "merkleroot" : "hex",           (string) The merkle root
  "time" : xxx,                   (numeric) The block time expressed in UNIX epoch time
  "mediantime" : xxx,             (numeric) The median block time expressed in UNIX epoch time
  "nonce" : n,                    (numeric) The nonce
  "bits" : "hex",                 (string) The bits
  "difficulty" : n,               (numeric) The difficulty
  "chainwork" : "hex",            (string) Expected number of hashes required to produce the current chain
  "nTx" : n,                      (numeric) The number of transactions in the block
  "previousblockhash" : "hex",    (string) The hash of the previous block
  "nextblockhash" : "hex"         (string) The hash of the next block
}
```

## Returns (for verbose = false)

| Name | Type   | Description                                                    |
| ---- | ------ | -------------------------------------------------------------- |
| hex  | string | A string that is serialized, hex-encoded data for block ‘hash’ |

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

```bash
curl https://mainnet.bitcoin.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
 -X POST \
 -H "Content-Type: application/json" \
 -d '{
	"jsonrpc": "1.0",
	"id": "curltest",
	"method": "getblockheader",
	"params": ["00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"]
}'
```

{% endtab %}

{% tab title="testnet" %}

```bash
curl https://testnet.bitcoin.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
 -X POST \
 -H "Content-Type: application/json" \
 -d '{
	"jsonrpc": "1.0",
	"id": "curltest",
	"method": "getblockheader",
	"params": ["00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"]
}'
```

{% endtab %}
{% endtabs %}