> For the complete documentation index, see [llms.txt](https://docs.watchdata.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.watchdata.io/blockchain-apis/bitcoin-api/blockchain-rpcs/getblockheader.md).

# 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’.

### Argument #1 - blockhash

**Type:** string, required

The block hash

### Argument #2 - verbose

**Type:** boolean, optional, default=true

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

### Result (for verbose = true)

```
{                                 (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
}
```

### Result (for verbose=false)

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

**Request**

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

```bash
curl --location --request POST 'https://btc.api.watchdata.io/node/jsonrpc?api_key=your_api_key' \
--header 'x-api-key: your_api_key' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
        "00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"
    ]
}'
```

{% endtab %}

{% tab title="Postman" %}

```json
URL: https://btc.api.watchdata.io/node/jsonrpc?api_key=your_api_key
RequestType: POST
Body: 
{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
        "00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"
    ]
}
```

{% endtab %}
{% endtabs %}

**Response**

```json
{
    "hash": "00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09",
    "confirmations": 735634,
    "height": 1000,
    "version": 1,
    "versionHex": "00000001",
    "merkleroot": "fe28050b93faea61fa88c4c630f0e1f0a1c24d0082dd0e10d369e13212128f33",
    "time": 1232346882,
    "mediantime": 1232344831,
    "nonce": 2595206198,
    "bits": "1d00ffff",
    "difficulty": 1,
    "chainwork": "000000000000000000000000000000000000000000000000000003e903e903e9",
    "nTx": 1,
    "previousblockhash": "0000000008e647742775a230787d66fdf92c46a48c896bfbc85cdc8acc67e87d",
    "nextblockhash": "00000000a2887344f8db859e372e7e4bc26b23b9de340f725afbf2edb265b4c6"
}
```


---

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