getblockheader

POST

https://btc-testnet.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns information about the block header given a block hash. You can specify whether to return a JSON object or raw hex-encoded string using the verbose flag.

Body

application/json

Returns information about the block header given a block hash. You can specify whether to return a JSON object or raw hex-encoded string using the verbose flag.

Request payload containing the documented method parameters and client request identifier.

jsonrpcstringrequired

JSON-RPC protocol version.

idstringrequired

Client-provided request identifier echoed in the response.

methodstringgetblockheaderrequired

JSON-RPC method name.

paramsArray<string | boolean>required

Parameters:

blockhash (string) — The hash of the block.
verbose (boolean, optional) — If true, returns a JSON object; if false, returns a hex string. Default is true.

Show child attributes

Single entry in the params array.

One of

JSON-RPC method parameters.

string

JSON-RPC method parameters.

boolean

Response

200OK

Block header information retrieved successfully

401Unauthorized

Unauthorized: API key is present but rejected by the NOWNodes gateway.

405Method Not Allowed

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

422Unprocessable Entity

Missing API key. The NOWNodes gateway returns plain text for this error.

500Internal Server Error

Internal Server Error

getblockheader

curl -X POST 'https://btc-testnet.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": []
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://btc-testnet.nownodes.io/");
const result = await provider.send("getblockheader", []);
console.log(result);

require 'eth'
require 'json'
require 'net/http'

uri = URI('https://btc-testnet.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "getblockheader",
  "params": [],
  "id": 1
}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://btc-testnet.nownodes.io/"))
response = w3.provider.make_request("getblockheader", [])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://btc-testnet.nownodes.io/"),
});

const result = await client.request({
  method: "getblockheader",
  params: [],
});

console.log(result);

const endpoint = "https://btc-testnet.nownodes.io/";
const apiKey = "YOUR_API_KEY";

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

  return response.json();
}

const result = await nownodesRequest({ jsonrpc: "2.0", method: "getblockheader", params: [], id: 1 });
console.log(result);

const response = await fetch('https://btc-testnet.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockheader",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockheader",
  "params": []
}

response = requests.post('https://btc-testnet.nownodes.io/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://btc-testnet.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": []
  }'

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

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockheader",
  "params": []
}

{
  "result": {
    "hash": "0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3",
    "confirmations": 1,
    "height": 956047,
    "version": 536870912,
    "versionHex": "20000000",
    "merkleroot": "8f837d8a16fc4b12271b30f898f22cf86566f6647381134b4035dced40d156fb",
    "time": 1770000000,
    "mediantime": 1770000000,
    "nonce": "0x0",
    "bits": "17021369",
    "target": "0000000000000000000213690000000000000000000000000000000000000000",
    "difficulty": "0x2",
    "chainwork": "00000000000000000000000000000000000000012160395a966c9f28bacc7b94",
    "nTx": 1,
    "previousblockhash": "0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3"
  },
  "error": null,
  "id": 1
}

{
  "result": null,
  "error": {
    "code": -3,
    "message": "Invalid parameter"
  },
  "id": 1
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "result": {
    "hash": "0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3",
    "confirmations": 1,
    "height": 956047,
    "version": 536870912,
    "versionHex": "20000000",
    "merkleroot": "8f837d8a16fc4b12271b30f898f22cf86566f6647381134b4035dced40d156fb",
    "time": 1770000000,
    "mediantime": 1770000000,
    "nonce": "0x0",
    "bits": "17021369",
    "target": "0000000000000000000213690000000000000000000000000000000000000000",
    "difficulty": "0x2",
    "chainwork": "00000000000000000000000000000000000000012160395a966c9f28bacc7b94",
    "nTx": 1,
    "previousblockhash": "0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3"
  },
  "error": {
    "code": -28,
    "message": "Service temporarily unavailable"
  },
  "id": "curltest"
}

Documentation

How to migrate to NOWNodes

getblockheader

Authorizations

Body

Response