getblockheader

POST

https://sys-btc.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

jsonrpcstringrequired

idstringrequired

methodstringgetblockheaderrequired

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

One of

string

boolean

Response

200OK

Block header information retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

getblockheader

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
      "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
      true
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://sys-btc.nownodes.io/");
const result = await provider.send("getblockheader", [
  "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  true
]);
console.log(result);

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

uri = URI('https://sys-btc.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "getblockheader",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    true
  ],
  "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://sys-btc.nownodes.io/"))
response = w3.provider.make_request("getblockheader", [
  "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  true
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "getblockheader",
  params: [
  "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  true
],
});

console.log(result);

const endpoint = "https://sys-btc.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: [
  "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  true
], id: 1 });
console.log(result);

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockheader",
      "params": [
        "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockheader",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    true
  ]
}

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

require 'net/http'
require 'json'

uri = URI('https://sys-btc.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
      "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
      true
    ]
  }'

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": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    true
  ]
}

{
  "result": {
    "hash": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    "confirmations": 105,
    "height": 855000,
    "version": 536870912,
    "versionHex": "20000000",
    "merkleroot": "e3abc1234...",
    "time": 1700000000,
    "mediantime": 1699995000,
    "nonce": 1234567890,
    "bits": "170d1f5d",
    "difficulty": 225983213292.9388,
    "chainwork": "0000000000000000000000000000000000000000230c36f8ff7f4fbee5b6a0c2",
    "previousblockhash": "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1",
    "nextblockhash": "0000000000000000000735c64b80cd102b8e4d67c2cc09db81fa4451a6f58e3a"
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

Documentation

How to migrate to NOWNodes

getblockheader

Authorizations

Body

Response