eth_getBlockByHash

Returns information about a block by hash on Arbitrum.

Why Arbitrum? Build on Ethereum's leading Layer 2 with 46% L2 market share and $12B+ TVL with full EVM compatibility, 1.5M daily transactions, and $3B+ DAO treasury for ecosystem growth.

Use Cases

The eth_getBlockByHash method is essential for:

• Block verification - Verify block data using its unique hash
• Chain reorganization handling - Track blocks during reorgs
• Cross-chain bridges - Verify block finality for high-volume DeFi (GMX, Uniswap, Aave), gaming, and cross-chain applications
• Deterministic queries - Get consistent block data regardless of chain state

Parameters

Parameter	Type	Required	Description
blockHash	DATA	Yes	32-byte block hash
fullTransactions	Boolean	Yes	If true, returns full transaction objects; if false, returns transaction hashes

Request

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockByHash",
  "params": [
    "0xcb51ef4d410f0ddfdf102f18e40a7e44748001bae0b0f5bc065aadd13fa3c9b0",
    false
  ],
  "id": 1
}

Returns

Returns the same block object as eth_getBlockByNumber, or null if no block is found.

Field	Type	Description
number	QUANTITY	Block number
hash	DATA	32-byte block hash
parentHash	DATA	32-byte parent block hash
timestamp	QUANTITY	Unix timestamp
gasUsed	QUANTITY	Total gas used
transactions	Array	Transaction objects or hashes

Code Examples

cURL

curl -X POST https://api-arbitrum-mainnet-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
      "0xcb51ef4d410f0ddfdf102f18e40a7e44748001bae0b0f5bc065aadd13fa3c9b0",
      false
    ],
    "id": 1
  }'

JavaScript

import { JsonRpcProvider } from 'ethers';

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

const blockHash = '0xcb51ef4d410f0ddfdf102f18e40a7e44748001bae0b0f5bc065aadd13fa3c9b0';
const block = await provider.getBlock(blockHash);

console.log('Block number:', block.number);
console.log('Timestamp:', new Date(block.timestamp * 1000));

Python

from web3 import Web3

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

block_hash = '0xcb51ef4d410f0ddfdf102f18e40a7e44748001bae0b0f5bc065aadd13fa3c9b0'
block = w3.eth.get_block(block_hash)

print(f'Block number: {block.number}')
print(f'Timestamp: {block.timestamp}')

Go

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, err := ethclient.Dial("https://api-arbitrum-mainnet-archive.n.dwellir.com/YOUR_API_KEY")
    if err != nil {
        log.Fatal(err)
    }

    blockHash := common.HexToHash("0xcb51ef4d410f0ddfdf102f18e40a7e44748001bae0b0f5bc065aadd13fa3c9b0")
    block, err := client.BlockByHash(context.Background(), blockHash)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Block number: %d\n", block.Number().Uint64())
}

Error Handling

Error Code	Message	Description
-32602	Invalid params	Invalid block hash format
-32000	Block not found	Block with this hash does not exist

Related Methods

• eth_getBlockByNumber - Get block by number
• eth_blockNumber - Get latest block number