on_get_block_hash - Monero

Example code for the on_get_block_hash JSON-RPC method. Complete guide on how to use on_get_block_hash JSON-RPC in GetBlock Web3 documentation.

This method returns the block hash at a given block height. Note the positional params array (a single-element array containing the height), not the usual object form.

Parameters

Parameter

Type

Required

Description

params[0]

unsigned int

Yes

Block height to look up

Request Example

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "on_get_block_hash",
    "params": [
        912345
    ],
    "id": "getblock.io"
}'

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "on_get_block_hash",
    "params": [
        912345
    ],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "on_get_block_hash",
    "params": [
        912345
    ],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "on_get_block_hash",
        "params": [
                912345
        ],
        "id": "getblock.io"
});

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}

Response Example

{
    "id": "getblock.io",
    "jsonrpc": "2.0",
    "result": "e22cf75f39ae720e8b71b3d120a5ac03f0db50bba6379e2850975b4859190bc6"
}

Response Parameters

Field

Type

Description

result

string

Block hash at the given height

Use Cases

Resolving height to hash for historical queries
Cursor-based pagination through historical blocks
Bridging height-based and hash-based block references

Error Handling

Status Code

Error Message

Cause

404

Not Found

Missing or invalid <ACCESS-TOKEN>

-32602

Invalid params

Request parameters are missing or malformed

429

Too Many Requests

Rate limit exceeded for your plan

SDK Integration

import monerojs from 'monero-javascript';

const daemon = await monerojs.connectToDaemonRpc('https://go.getblock.io/<ACCESS-TOKEN>/');

// Most methods are exposed directly on the daemon client. For raw access:
const result = await daemon.getDaemonConnection().sendJsonRequest('on_get_block_hash', [912345]);
console.log(result);

from monero.backends.jsonrpc import JSONRPCDaemon
from monero.daemon import Daemon

backend = JSONRPCDaemon(host='go.getblock.io', port=443, path='/<ACCESS-TOKEN>/', protocol='https')
daemon = Daemon(backend)

# For methods covered by the typed API, use the daemon attribute directly.
# For raw RPC access:
result = backend.raw_request('on_get_block_hash', [912345])
print(result)

Previousis_key_image_spent - Monero Nextrelay_tx - Monero

Last updated 13 days ago

Was this helpful?