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# Get Block Header
Request the header for a given block.
```
GET /header/:hash
```
## Parameters
* **hash** - `string` - The block hash
* **at** - `string` (optional) - Access Token (json web token). Required if authentication is activated. Alternatively, the access token can be passed through the `Authorization` HTTP header (with the `Bearer` scheme).
### Examples
```
GET /header/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
```
#### Success
Status code 200 with JSON response:
```json
{
"hash": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
"confirmations": 475000,
"height": 0,
"version": 1,
"versionHex": "00000001",
"merkleroot": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"time": 1231006505,
"mediantime": 1231006505,
"nonce": 2083236893,
"bits": "1d00ffff",
"difficulty": 1,
"chainwork": "0000000000000000000000000000000000000000000000000000000100010001",
"nextblockhash": "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"
}
```
#### Failure
Status code 400 with JSON response:
```json
{
"status": "error",
"error": "< error message > "
}
```
