---
description: >-
  Discover 'eth_getTransactionByBlockHashAndIndex' in Tron's JSON-RPC API
  Interface for precise transaction retrieval.
---

# eth\_getTransactionByBlockHashAndIndex - TRON

## Description

The 'eth\_getTransactionByBlockHashAndIndex' Web3 method is a vital component of the Tron protocol's JSON-RPC API Interface, designed to facilitate efficient transaction retrieval by block hash and index. This RPC protocol method allows developers to access specific transaction details within a block, enhancing the precision and reliability of blockchain data interactions. By providing a block hash and an index position, users can retrieve comprehensive transaction information, including sender, receiver, value, and more. This functionality is crucial for applications requiring detailed transaction analysis, auditing, or monitoring within the Tron network. With its user-friendly and technical design, the 'eth\_getTransactionByBlockHashAndIndex' method streamlines blockchain data access for developers and users alike.

## Supported Networks

The eth\_getTransactionByBlockHashAndIndex RPC method supports the following network types

* **Mainnet**
* **Testnets**

## Parameters

Here is the list of parameters eth\_getTransactionByBlockHashAndIndex method needs to be executed.

* **Block Hash**
  * **Requirement**: Required
  * **Type**: String
  * **Description**: The hash of the block containing the transaction.
  * **Supported Values**: A 32-byte hash string, represented as a hexadecimal value.
* **Transaction Index**
  * **Requirement**: Required
  * **Type**: String
  * **Description**: The index position of the transaction within the block.
  * **Supported Values**: A hexadecimal string representing the index, starting from "0x0".

### URL

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

Here’s a sample cURL request using eth\_getTransactionByBlockHashAndIndex

Request

```json
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/jsonrpc' 
--header 'Content-Type: application/json' 
{"jsonrpc": "2.0", "method": "eth_getTransactionByBlockHashAndIndex", "params": ["00000000020ef11c87517739090601aa0a7be1de6faebf35ddb14e7ab7d1cc5b", "0x0"], "id": "getblock.io"}
```

Response

```json

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

## Body Parameters

Here is the list of body parameters for the `eth_getTransactionByBlockHashAndIndex` method:

1. **jsonrpc**: A string specifying the version of the JSON-RPC protocol. For Ethereum, this is typically "2.0".
2. **id**: A unique identifier for the request. This can be any string or number that the client uses to match the response with the request.
3. **result**: This field contains the transaction object if the request is successful. If the transaction is not found, it will be `null`. The transaction object includes several fields, such as:
   * **blockHash**: The hash of the block containing the transaction.
   * **blockNumber**: The number of the block containing the transaction.
   * **from**: The address of the sender.
   * **gas**: The gas provided by the sender.
   * **gasPrice**: The price of gas in wei.
   * **hash**: The hash of the transaction.
   * **input**: The data sent along with the transaction.
   * **nonce**: The number of transactions made by the sender prior to this one.
   * **to**: The address of the receiver. Null when it is a contract creation transaction.
   * **transactionIndex**: The index position of the transaction in the block.
   * **value**: The value transferred in wei.
   * **v, r, s**: Values used in the transaction's signature.

Note: The `params` field, which typically includes the block hash and the transaction index, is part of the request, not the response.

## Use Case

Here are some use-cases for the `eth_getTransactionByBlockHashAndIndex` method:

1. **Transaction Verification and Auditing**: This method is useful for verifying the authenticity and details of a specific transaction within a known block. By retrieving a transaction using the block hash and the transaction index, developers and auditors can ensure that the transaction data matches expected values, such as sender, recipient, and value transferred. This is particularly important in scenarios where transaction integrity is critical, such as in financial applications or when auditing smart contract interactions.
2. **Block Data Analysis**: Developers and analysts can use this method to extract and analyze transactions from a specific block. By iterating over transaction indices within a block, they can gather comprehensive data about all transactions included in that block. This can be useful for performance analysis, understanding transaction patterns, and identifying anomalies or trends in blockchain activity.
3. **Debugging and Development**: In the development and testing phases of decentralized applications (dApps), developers may need to track down specific transactions to troubleshoot issues or verify the behavior of smart contracts. By accessing transactions directly through their block hash and index, developers can efficiently pinpoint transactions of interest and examine their input, output, and execution results. This aids in debugging and refining smart contract code and transaction handling logic.

## Code for eth\_getTransactionByBlockHashAndIndex

```python
import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"
headers = {
    "Content-Type": "application/json"
}
payload = {"jsonrpc": "2.0", "method": "eth_getTransactionByBlockHashAndIndex", "params": ["00000000020ef11c87517739090601aa0a7be1de6faebf35ddb14e7ab7d1cc5b", "0x0"], "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)
```

## Common Errors

Common Errors\
When using the eth\_getTransactionByBlockHashAndIndex RPC Tron method, the following issues may occur:

* Invalid Block Hash: If the provided block hash is incorrect or does not exist, the method will return null. Ensure the block hash is accurate and corresponds to a valid block in the Tron blockchain.
* Index Out of Range: Providing an index that exceeds the number of transactions in the block will result in a null response. Verify the index value to ensure it is within the valid range for the specified block.
* Network Connectivity Issues: Poor network connectivity or misconfigured endpoints can lead to failed requests. Check your network connection and endpoint configuration to ensure reliable communication with the Tron network.
* Insufficient Permissions: Accessing certain transaction data may require specific permissions or API access rights. Verify that your API key or account has the necessary permissions to access transaction details.

The eth\_getTransactionByBlockHashAndIndex method is a valuable tool in Web3 applications for efficiently retrieving specific transaction data from a block. By allowing developers to access detailed transaction information using a combination of block hash and index, this method facilitates precise data retrieval, which is essential for building robust and responsive blockchain-based applications.

### conclusion

The `eth_getTransactionByBlockHashAndIndex` RPC method is used to retrieve a specific transaction from a block in the Ethereum blockchain by providing the block hash and the transaction index. This function is crucial for developers who need precise transaction data for auditing or analysis purposes. While Ethereum and Tron are distinct blockchain platforms, understanding Ethereum's RPC methods, like `eth_getTransactionByBlockHashAndIndex`, can provide valuable insights into transaction handling that might be applicable when working with other blockchain technologies, including Tron.
