Get block hash by block number

POST

https://tao.nownodes.io/chain_getBlockHash

Authorizations

ApiKeyAuthApiKeyAuth

API_key string

NOWNodes API key passed in the api-key header.

Returns the block hash using the block number in the chain.

Body

application/json

JSON-RPC request parameters

jsonrpcstringrequired

JSON-RPC version

idstringrequired

Request identifier

methodstringrequired

Method name

paramsArray<integer>required

Array containing block number

Response

200OK

Block hash by block number

400Bad Request

Malformed address or application ID

401Unauthorized

Invalid API key

500Internal Server Error

Internal server error

Get block hash by block number

curl -X POST 'https://tao.nownodes.io/chain_getBlockHash' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": "test",
    "method": "chain_getBlockHash",
    "params": [
      20440517
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://tao.nownodes.io/chain_getBlockHash");
const result = await provider.send("chain_getBlockHash", [
  20440517
]);
console.log(result);

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

uri = URI('https://tao.nownodes.io/chain_getBlockHash')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "chain_getBlockHash",
  "params": [
    20440517
  ],
  "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://tao.nownodes.io/chain_getBlockHash"))
response = w3.provider.make_request("chain_getBlockHash", [
  20440517
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "chain_getBlockHash",
  params: [
  20440517
],
});

console.log(result);

const endpoint = "https://tao.nownodes.io/chain_getBlockHash";
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: "chain_getBlockHash", params: [
  20440517
], id: 1 });
console.log(result);

const response = await fetch('https://tao.nownodes.io/chain_getBlockHash', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "id": "test",
      "method": "chain_getBlockHash",
      "params": [
        20440517
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "id": "test",
  "method": "chain_getBlockHash",
  "params": [
    20440517
  ]
}

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

require 'net/http'
require 'json'

uri = URI('https://tao.nownodes.io/chain_getBlockHash')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "id": "test",
    "method": "chain_getBlockHash",
    "params": [
      20440517
    ]
  }'

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",
  "id": "test",
  "method": "chain_getBlockHash",
  "params": [
    20440517
  ]
}

200

{
  "jsonrpc": "2.0",
  "result": "0x1e2dc73f800f496f8fc2e1ab3e8b8037267546cf24198b0c6e5a7b87e8b38320",
  "id": "test"
}