eth_getBlockByHash

Returns information about a block by block hash.

When to Use This Method

Use eth_getBlockByHash to:

• Retrieve Specific Block - Get block data using its unique hash
• Verify Block Integrity - Confirm block contents haven't changed
• Cross-Reference Blocks - Link transactions to specific blocks
• Chain Reorganization Detection - Track block validity
• Historical Data Access - Query immutable block records

Parameters

1. Block Hash (required):

   • 32-byte block hash as hexadecimal

2. Transaction Details (required):

   • true - Returns full transaction objects
   • false - Returns only transaction hashes

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockByHash",
  "params": [
    "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b",
    true
  ],
  "id": 1
}

Returns

Block object or null if block not found.

Implementation Examples

cURL

curl -X POST https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
      "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b",
      true
    ],
    "id": 1
  }'

JavaScript

// Using ethers.js
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY');

const blockHash = '0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b';
const block = await provider.getBlock(blockHash);
console.log('Block number:', block.number);
console.log('Timestamp:', new Date(block.timestamp * 1000));

// Using web3.js
import Web3 from 'web3';

const web3 = new Web3('https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY');

const block = await web3.eth.getBlock(blockHash, true);
console.log('Block:', block);

Python

from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY'))

block_hash = '0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b'
block = w3.eth.get_block(block_hash)
print(f"Block #{block['number']} with {len(block['transactions'])} transactions")

Common Use Cases

Block Verification

async function verifyBlock(blockHash, expectedData) {
  const block = await provider.getBlock(blockHash, true);
  
  if (!block) {
    throw new Error('Block not found');
  }
  
  return {
    valid: true,
    number: block.number,
    transactionCount: block.transactions.length,
    timestamp: new Date(block.timestamp * 1000),
    gasUsed: block.gasUsed
  };
}

Best Practices

1. Always check for null responses
2. Cache block data when possible
3. Use block hashes for permanent references
4. Validate block hash format before querying

Error Codes

Code	Message	Description
-32602	Invalid params	Invalid block hash format
-32000	Block not found	Block doesn't exist

Related Methods

• eth_getBlockByNumber - Get block by number
• eth_blockNumber - Get latest block number
• eth_getTransactionByBlockHashAndIndex - Get transaction from block