Get a block hash by height.

GET

https://dgbbook.nownodes.io/api/v2/block-index/{height}

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns the block hash for a height on the backend main chain. Blockbook follows the backend main chain; after a rollback or reorg, height lookups resolve to the current main-chain block.

Load estimate: Low; indexed height-to-hash lookup.

Parameters

heightinteger>= 0requiredpath

Block height on the backend main chain.

Response

200OK

Block hash at the requested height.

400Bad Request

Bad Request

401Unauthorized

Unauthorized. Returned when the api-key header is missing, empty, or not accepted by the NOWNodes gateway. The body is plain text.

405Method Not Allowed

Method Not Allowed. Returned by the NOWNodes gateway for malformed or unsupported gateway-level requests.

422Unprocessable Entity

Unprocessable Entity. Returned by the NOWNodes gateway for requests it accepts but cannot process. The body is plain text.

500Internal Server Error

Internal Server Error

503Service Unavailable

Service Unavailable

default

Public API error.

Get a block hash by height.

curl -X GET 'https://dgbbook.nownodes.io/api/v2/block-index/{height}'

const response = await fetch('https://dgbbook.nownodes.io/api/v2/block-index/{height}', {
  method: 'GET',
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://dgbbook.nownodes.io/api/v2/block-index/{height}')
request = Net::HTTP::Get.new(uri)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

import requests

response = requests.get('https://dgbbook.nownodes.io/api/v2/block-index/{height}')
data = response.json()

const response = await fetch('https://dgbbook.nownodes.io/api/v2/block-index/{height}', {
  method: 'GET',
});

const data = await response.json();

const endpoint = "https://dgbbook.nownodes.io/api/v2/block-index/{height}";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "GET",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({});
console.log(result);

const response = await fetch('https://dgbbook.nownodes.io/api/v2/block-index/{height}', {
  method: 'GET',
});

const data = await response.json();

import requests

response = requests.get('https://dgbbook.nownodes.io/api/v2/block-index/{height}')
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://dgbbook.nownodes.io/api/v2/block-index/{height}')
request = Net::HTTP::Get.new(uri)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

{
  "blockHash": "5a417407ef1ca4eae87ea08142c953f2e8177689ddab8bf3ac57efd0486b906e"
}

{}

Unknown API_key

Method Not Allowed

Missing API_key

{}

{}

{
  "error": "Internal server error"
}