preciousblock

POST

https://btc-testnet4.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Marks a block as "precious," causing the node to reconsider the chain from that block. This can be used to manually reorganize the chain to a particular fork.

Body

application/json

Marks a block as "precious," causing the node to reconsider the chain from that block. This can be used to manually reorganize the chain to a particular fork.

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.

methodstringpreciousblockrequired

JSON-RPC method name.

paramsArray<string>required

Parameters:

blockhash (string, required) — The hash of the block to mark as precious.

Response

200OK

Block marked as precious 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

preciousblock

curl -X POST 'https://btc-testnet4.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "preciousblock",
    "params": [
      "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://btc-testnet4.nownodes.io/");
const result = await provider.send("preciousblock", [
  "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
]);
console.log(result);

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

uri = URI('https://btc-testnet4.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "preciousblock",
  "params": [
    "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
  ],
  "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-testnet4.nownodes.io/"))
response = w3.provider.make_request("preciousblock", [
  "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://btc-testnet4.nownodes.io/"),
});

const result = await client.request({
  method: "preciousblock",
  params: [
  "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
],
});

console.log(result);

const endpoint = "https://btc-testnet4.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: "preciousblock", params: [
  "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
], id: 1 });
console.log(result);

const response = await fetch('https://btc-testnet4.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "preciousblock",
      "params": [
        "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "preciousblock",
  "params": [
    "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
  ]
}

response = requests.post('https://btc-testnet4.nownodes.io/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://btc-testnet4.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "preciousblock",
    "params": [
      "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
    ]
  }'

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": "preciousblock",
  "params": [
    "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
  ]
}

{
  "result": null,
  "error": null,
  "id": 1
}

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

Unknown API_key

Method Not Allowed

Missing API_key

{
  "result": null,
  "error": {
    "code": -28,
    "message": "Service temporarily unavailable"
  },
  "id": "curltest"
}

Documentation

How to migrate to NOWNodes

preciousblock

Authorizations

Body

Response