getfinalizedblockhash - Bitcoin

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

This method returns the hash of the finalized block. A finalized block is a block that has been deeply confirmed and is considered irreversible.

Parameters

None

Request

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

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "getfinalizedblockhash",
    "params": [],
    "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)))
    .catch(error => console.log(error));

import requests
import json

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

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

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

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

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "getfinalizedblockhash",
            "params": [],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "000000000000000000043a9302e08c16ea186950f42a5498320ddd1bd7ab3420"
}

Response Parameters

Field

Type

Description

result

string

The hash of the finalized block as a hex string.

Use Case

The getfinalizedblockhash method is essential for:

Determining transaction finality
Building confirmation tracking systems
Implementing safe payment thresholds
Exchange deposit confirmation logic
High-value transaction verification
Building merchant payment systems

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN.

-1

No finalized block

No block has been finalized yet.

Integration With Web3

The getfinalizedblockhash method helps developers:

Build payment confirmation systems
Implement finality guarantees
Create safe deposit tracking
Support high-value transaction workflows
Build exchange integration systems

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