Get Block Hash by Height

POST

https://ont.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Retrieves the hash of a block at a specific height (block number). Block height starts at 0 for the genesis block and increments by 1 for each subsequent block.

Body

application/json

jsonrpcstringrequired

The JSON-RPC protocol version. Must be "2.0" for JSON-RPC 2.0 specification compliance.

methodstringrequired

The RPC method name. For this operation, it must be "getblockhash".

paramsArray<integer>required

An array containing a single parameter: the block height (index). Block height is a zero-based integer index.

idintegerrequired

A unique identifier for the request, used to correlate the response with the request.

Response

200OK

Successful response containing the block hash.

Get Block Hash by Height

curl -X POST 'https://ont.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "getblockhash",
    "params": [
      12345
    ],
    "id": 1
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://ont.nownodes.io/");
const result = await provider.send("getblockhash", [
  12345
]);
console.log(result);

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

uri = URI('https://ont.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "getblockhash",
  "params": [
    12345
  ],
  "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://ont.nownodes.io/"))
response = w3.provider.make_request("getblockhash", [
  12345
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "getblockhash",
  params: [
  12345
],
});

console.log(result);

const endpoint = "https://ont.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: "getblockhash", params: [
  12345
], id: 1 });
console.log(result);

const response = await fetch('https://ont.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "getblockhash",
      "params": [
        12345
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "getblockhash",
  "params": [
    12345
  ],
  "id": 1
}

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

require 'net/http'
require 'json'

uri = URI('https://ont.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "getblockhash",
    "params": [
      12345
    ],
    "id": 1
  }'

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

Request Body

{
  "jsonrpc": "2.0",
  "method": "getblockhash",
  "params": [
    12345
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5e8e8ff715441dd816ed727e1d240ad23310d884427dbbf4282f740671778e1c"
}

Documentation

How to migrate to NOWNodes

Get Block Hash by Height

Authorizations

Body

Response