debug_traceBlockByHash - Linea

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

This method replays every transaction in a block identified by hash and returns an execution trace for each. It is used to analyze all execution in a block at once.

Parameters

Parameter	Type	Required	Description
blockHash	string	Yes	32-byte block hash
options	object	No	Tracer options, such as the tracer name and its configuration

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "debug_traceBlockByHash",
    "params": ["0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f", {"tracer": "callTracer"}],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'debug_traceBlockByHash',
    params: ["0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f", {"tracer": "callTracer"}],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'debug_traceBlockByHash',
        'params': ["0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f", {"tracer": "callTracer"}],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

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

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "debug_traceBlockByHash",
            "params": ["0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f", {"tracer": "callTracer"}],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": [
        {
            "txHash": "0x4a7b0c3d6e9f2a5b8c1d4e7f0a3b6c9d2e5f8a1b4c7d0e3f6a9b2c5d8e1f4a7b",
            "result": {
                "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
                "to": "0xe5D7C2a44FfDDf6b295A15c148167daaAf5Cf34f",
                "gasUsed": "0x5208",
                "output": "0x",
                "type": "CALL",
                "calls": []
            }
        }
    ]
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	array	Array of per-transaction traces for the block

Trace Entry

Field	Type	Description
txHash	string	Hash of the traced transaction
result	object	Execution trace for the transaction, shaped by the tracer

Use Cases

• Block Analysis: Trace all execution in a block by hash

• Reorg-Safe Tracing: Pin a trace to a specific block hash

• Internal Transfers: Extract internal value transfers across a block

• Auditing: Review every call frame produced in a block

Error Handling

Error Code	Message	Description
-32602	Invalid params	The block number or hash is malformed or out of range
-32603	Internal error	The node failed to read the block

Web3 Integration

Ethers.js

ethers-example.js

const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const traces = await provider.send('debug_traceBlockByHash', ['0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f', { tracer: 'callTracer' }]);
console.log(traces);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';
import { linea } from 'viem/chains';

const client = createPublicClient({ chain: linea, transport: http('https://go.getblock.io/<ACCESS-TOKEN>/') });

const traces = await client.request({ method: 'debug_traceBlockByHash', params: ['0x8e3f5b2a9c1d4e7f0a6b3c8d5e2f9a1b4c7d0e3f6a9b2c5d8e1f4a7b0c3d6e9f', { tracer: 'callTracer' }] });
console.log(traces);