debug_traceBlock - BNB Smart Chain

Explore block execution details using debug_traceBlock in the JSON-RPC API Interface for BSC, offering in-depth technical insights.

The RPC method provides detailed execution traces of all transactions within a block on BSC, aiding in debugging and performance analysis.

The debug_traceBlock method in the BSC protocol provides detailed execution traces for all transactions within a specified block. Utilizing the debug_traceBlock Web3 interface, developers can analyze transaction behaviors, including internal calls and state changes, facilitating in-depth debugging and performance analysis.

As part of the debug_traceBlock RPC protocol, this method returns comprehensive data, such as opcode execution and gas usage, enabling efficient troubleshooting. It is an invaluable tool for developers aiming to optimize smart contracts and ensure robust application performance on the BNB Smart Chain.

Supported Networks

The debug_traceBlock JSON-RPC API method supports the following network types:

Mainnet
Testnet

Parameters

Here is the list of parameters debug_traceBlock method needs to be executed. Always format the method name as inline code (wrapped in backticks).

blockhash:
- Type: String
- Description: The block hash of the block to be traced.
- Required: Yes
- Default/Supported Values: The hash should be a valid hexadecimal string representing the block hash.
traceOptions:
- Type: Object or null
- Description: An optional parameter that can be used to specify additional configurations for the trace operation. In this request, it is set to null.
- Required: No
- Default/Supported Values: If provided, it can include options such as tracer, timeout, and other trace configurations. If not needed, it can be set to null as shown in the request.

Request Example

API Endpoint

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

Request

Here’s a sample cURL request using debug_traceBlock :

curl --location --request POST https://go.getblock.io/<ACCESS-TOKEN>/
--header 'Content-Type: application/json' 
--data-raw {"jsonrpc": "2.0",
"method": "debug_traceBlock",
"params": ["0xf90213a01e77d8f1267348b516ebc4f4da1e2aa59f85f0cbd853949500ffac8bfc38ba14a01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347942a65aca4d5fc5b5c859090a6c34d164135398226a00b5e4386680f43c224c5c037efc0b645c8e1c3f6b30da0eec07272b4e6f8cd89a056e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421a056e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421b901000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000086057a418a7c3e83061a80832fefd880845622efdc96d583010202844765746885676f312e35856c696e7578a03fbea7af642a4e20cd93a945a1f5e23bd72fc5261153e09102cf718980aeff38886af23caae95692ef", null],
"id": "getblock.io"}

wscat -c wss://go.getblock.io/{ACCESS_TOKEN}/
{
    "jsonrpc": "2.0",
    "method": "debug_traceBlock",
    "params": [
        "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",
        null
    ],
    "id": "getblock.io"
}

Response

Below is a sample JSON response returned by debug_traceBlock upon a successful call:


{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "error": {
    "code": -32000,
    "message": "could not decode block: rlp: expected input list for types.Header, decoding into (types.Block)(types.extblock).Header"
  }
}

Body Parameters

Here is the list of body parameters for debug_traceBlock method:

jsonrpc: The version of the JSON-RPC protocol being used. Typically, this is "2.0".
id: A unique identifier for the request. This can be any string or number, and it is used to match the response with the request.
error: An object containing details about any error that occurred during the processing of the request. This includes:
- code: A numeric code indicating the type of error. In this case, -32000 is a server error code.
- message: A human-readable message providing more details about the error. Here, it indicates a problem with decoding a block due to an incorrect RLP (Recursive Length Prefix) encoding.

These parameters are part of the response structure when an error occurs during the execution of the debug_traceBlock method.

Use Cases

Here are some use-cases for debug_traceBlock method:

Analyzing Transaction Execution: The debug_traceBlock method is invaluable for developers who need to analyze the execution of transactions within a block. By tracing the execution, developers can understand the sequence of operations, identify any errors or unexpected behavior, and optimize smart contracts for better performance and reduced gas usage.
Security Audits: This method is also useful for security auditors who need to perform a detailed examination of transactions to detect vulnerabilities or malicious activities. By tracing each transaction step-by-step, auditors can ensure that smart contracts behave as expected and that there are no security loopholes.
Debugging and Testing: During the development phase, developers can use debug_traceBlock to test and debug their smart contracts. It allows them to see the internal state changes and execution paths, which can help in identifying bugs or logic errors that need to be addressed before deployment.

Code for debug_traceBlock


import requests
import json
url = "https://go.getblock.io/<ACCESS-TOKEN>/"
headers = {
    "Content-Type": "application/json"
}
payload = {"jsonrpc": "2.0",
"method": "debug_traceBlock",
"params": ["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", null],
"id": "getblock.io"}

response = requests.post(url, headers=headers, data=json.dumps(payload))

# Check the response and print the result
if response.status_code == 200:
    print("Result:", response.json().get("result"))
else:
    print("Error:", response.status_code, response.text)

const axios = require('axios');

const url = "https://go.getblock.io/<ACCESS-TOKEN>/";
const payload = {"jsonrpc": "2.0",
"method": "debug_traceBlock",
"params": ["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", null],
"id": "getblock.io"};

axios.post(url, payload, {
  headers: { "Content-Type": "application/json" }
})
.then(response => {
  console.log("Result:", response.data.result);
})
.catch(error => {
  if (error.response) {
    console.error("Error:", error.response.status, error.response.data);
  } else {
    console.error("Request failed:", error.message);
  }
});

Common Errors

When using the debug_traceBlock JSON-RPC API BSC method, the following issues may occur:

Invalid Block Parameter: If the block parameter is not correctly formatted or does not exist, the method may return an error. Ensure that the block hash or number provided is accurate and corresponds to a valid block on the BSC network.
Node Synchronization: If the node is not fully synchronized with the BSC blockchain, trace results may be incomplete or inaccurate. Verify that your node is up-to-date and fully synchronized before executing the trace operation.
Resource Limitations: Tracing a block can be resource-intensive, potentially leading to timeouts or performance degradation. Consider increasing the node's computational resources or using a more performant node setup to handle extensive trace operations.
Permission Restrictions: Access to debug methods may be restricted in some node configurations. Ensure that your node's configuration allows for debug operations and that any necessary permissions are granted.

The debug_traceBlock method is invaluable for Web3 applications as it provides in-depth insights into the execution of transactions within a block. This detailed tracing capability assists developers in diagnosing issues, optimizing smart contract performance, and ensuring the reliability of decentralized applications on the BSC network.

Conclusion

The debug_traceBlock method in JSON-RPC is a crucial tool for developers working on blockchain platforms like BSC (BNB Smart Chain). It allows for in-depth analysis and debugging of block execution, providing insights into the state changes and transactions within a specific block. By utilizing debug_traceBlock, developers can ensure the reliability and efficiency of smart contracts and blockchain applications on BSC.

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Last updated 23 days ago