Getblockhash

getblockhash operations.

getblockhash

post

Returns the block hash of the block at the given height in the blockchain. You must provide a block height (0-based index).

Authorizations

api-keyAuth

api-keystringRequired

NOWNodes API key passed in the api-key header.

Body

application/json

Request payload containing the documented method parameters and client request identifier.

jsonrpcstringRequired

JSON-RPC protocol version.

Example: 1.0

idstringRequired

Client-provided request identifier echoed in the response.

Example: curltest

methodstring · enumRequired

JSON-RPC method name.

Example: getblockhashPossible values:

paramsinteger[]Required

Parameters:

1. height (integer) — The height (index) of the block.

Example: [855000]

Responses

200

Block hash successfully retrieved

application/json

Object containing getblockhash response details.

resultstring · nullableRequired

Method-specific result returned by getblockhash.

Example: 0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3

errorone of · nullableRequired

JSON-RPC error object or null on success.

or

stringOptional

JSON-RPC error object. Null when the request succeeds.

Example: {"code":-28,"message":"Service temporarily unavailable"}

idone of · nullableRequired

Request id echoed by the server.

stringOptional

Client-provided request identifier echoed in the response.

Example: curltest

or

integerOptional

Client-provided request identifier echoed in the response.

Example: curltest

Other propertiesanyOptional

401

Unauthorized: API key is present but rejected by the NOWNodes gateway.

text/plain

405

Method Not Allowed. Returned by the NOWNodes gateway for malformed or unsupported gateway-level requests.

text/plain

422

Missing API key. The NOWNodes gateway returns plain text for this error.

text/plain

500

Internal Server Error

application/json

post/

HTTPcURLJavaScriptPython

POST / HTTP/1.1
Host: btc-testnet.nownodes.io
api-key: YOUR_API_KEY
Content-Type: application/json
Accept: */*
Content-Length: 75

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockhash",
  "params": [
    855000
  ]
}

{
  "result": "0000000000000000000160424415c96b888cc76a350b6f4218beef1caf1f71b3",
  "error": null,
  "id": 1
}