Calculate PoW hash for a block candidate

POST

https://xmr.nownodes.io/json_rpc

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Calculates the proof-of-work hash for a given block candidate blob.

Body

application/json

jsonrpcstring

idstring

methodstring

paramsobject

Show child attributes

major_versionintegerrequired

The major version of Monero protocol at this block height

heightintegerrequired

Block height

block_blobstringrequired

Hexadecimal blob of the block candidate

seed_hashstringrequired

RandomX seed hash

Response

200OK

PoW hash calculation result

400Bad Request

Bad Request - invalid parameters

403Forbidden

Forbidden

404Not Found

Not Found

500Internal Server Error

Internal Server Error

Calculate PoW hash for a block candidate

curl -X POST 'https://xmr.nownodes.io/json_rpc' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": "0",
    "method": "calc_pow",
    "params": {
      "major_version": 14,
      "height": 2286447,
      "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
      "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
    }
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://xmr.nownodes.io/json_rpc");
const result = await provider.send("calc_pow", {
  "major_version": 14,
  "height": 2286447,
  "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
  "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
});
console.log(result);

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

uri = URI('https://xmr.nownodes.io/json_rpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "calc_pow",
  "params": {
    "major_version": 14,
    "height": 2286447,
    "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
    "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
  },
  "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://xmr.nownodes.io/json_rpc"))
response = w3.provider.make_request("calc_pow", {
  "major_version": 14,
  "height": 2286447,
  "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
  "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
})
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "calc_pow",
  params: {
  "major_version": 14,
  "height": 2286447,
  "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
  "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
},
});

console.log(result);

const endpoint = "https://xmr.nownodes.io/json_rpc";
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: "calc_pow", params: {
  "major_version": 14,
  "height": 2286447,
  "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
  "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
}, id: 1 });
console.log(result);

const response = await fetch('https://xmr.nownodes.io/json_rpc', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "id": "0",
      "method": "calc_pow",
      "params": {
        "major_version": 14,
        "height": 2286447,
        "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
        "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
      }
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "id": "0",
  "method": "calc_pow",
  "params": {
    "major_version": 14,
    "height": 2286447,
    "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
    "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
  }
}

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

require 'net/http'
require 'json'

uri = URI('https://xmr.nownodes.io/json_rpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "id": "0",
    "method": "calc_pow",
    "params": {
      "major_version": 14,
      "height": 2286447,
      "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
      "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
    }
  }'

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": "0",
  "method": "calc_pow",
  "params": {
    "major_version": 14,
    "height": 2286447,
    "block_blob": "0e0ed286da8006ecdc1aab3033cf1716c52f13f9d8ae005...",
    "seed_hash": "d432f499205150873b2572b5f033c9c6e4b7c6f3394bd2dd93822cd7085e7307"
  }
}

{
  "id": "string",
  "jsonrpc": "string",
  "result": "d0402d6834e26fb94a9ce38c6424d27d2069896a9b8b1ce685d79936bca6e0a8"
}

{
  "error": "Invalid block_blob or seed_hash"
}

Insufficient permissions

{
  "error": "Block candidate not found"
}

{
  "error": "Internal server error"
}

Documentation

How to migrate to NOWNodes

Calculate PoW hash for a block candidate

Authorizations

Body

Response