Skip to main content
POST
/
evm
eth_getHeaderByHash
curl --request POST \
  --url https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_getHeaderByHash",
  "params": [
    "0x2ce91ae0ed242b4b78b432a45b982fb81a414d6b04167762ed3c7446710a4b8e"
  ],
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {}
}
The eth_getHeaderByHash JSON-RPC method returns the block header information for a given block hash. This method provides header data without the transaction list, offering a lightweight way to access block metadata when you have the specific block hash.
Get your own node endpoint todayStart for free and get your app to production levels immediately. No credit card required.You can sign up with your GitHub, X, Google, or Microsoft account.

​
Parameters

  1. block_hash (string) — The hash of the block as a hexadecimal string

​
Response

The method returns block header information or null if the block doesn’t exist.

​
Response structure

Block header fields:
  • hash — The block hash (matches the input parameter)
  • parentHash — Hash of the parent block
  • number — The block number
  • timestamp — The unix timestamp when the block was collated
  • gasLimit — The maximum gas allowed in this block
  • gasUsed — The total gas used by all transactions in this block
  • difficulty — The difficulty for this block
  • totalDifficulty — The total difficulty of the chain until this block
  • miner — The address of the beneficiary to whom the mining rewards were given
  • nonce — The nonce used to generate this block
  • sha3Uncles — SHA3 of the uncles data in the block
  • logsBloom — The bloom filter for the logs of the block
  • transactionsRoot — The root of the transaction trie of the block
  • stateRoot — The root of the final state trie of the block
  • receiptsRoot — The root of the receipts trie of the block

​
Hash validation

Block hash format:
  • Must be a valid 32-byte hexadecimal string with “0x” prefix
  • Example: “0x2ce91ae0ed242b4b78b432a45b982fb81a414d6b04167762ed3c7446710a4b8e”
  • Returns null if the hash doesn’t correspond to any existing block

​
Usage example

​
Basic implementation

// Get block header by hash
const getHeaderByHash = async (blockHash) => {
  const response = await fetch('https://hyperliquid-mainnet.core.chainstack.com/YOUR_ENDPOINT/evm', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      jsonrpc: '2.0',
      method: 'eth_getHeaderByHash',
      params: [blockHash],
      id: 1
    })
  });
  
  const data = await response.json();
  return data.result;
};

// Validate block hash and get header info
const validateBlockHash = async (blockHash) => {
  try {
    const header = await getHeaderByHash(blockHash);
    
    if (header === null) {
      return { valid: false, error: 'Block not found' };
    }
    
    return {
      valid: true,
      header,
      blockNumber: parseInt(header.number, 16),
      timestamp: new Date(parseInt(header.timestamp, 16) * 1000),
      gasUtilization: (parseInt(header.gasUsed, 16) / parseInt(header.gasLimit, 16) * 100).toFixed(2)
    };
  } catch (error) {
    return { valid: false, error: error.message };
  }
};

// Compare two block headers
const compareBlockHeaders = async (hash1, hash2) => {
  const [header1, header2] = await Promise.all([
    getHeaderByHash(hash1),
    getHeaderByHash(hash2)
  ]);
  
  if (!header1 || !header2) {
    return { error: 'One or both blocks not found' };
  }
  
  return {
    block1: {
      hash: header1.hash,
      number: parseInt(header1.number, 16),
      timestamp: parseInt(header1.timestamp, 16),
      gasUsed: parseInt(header1.gasUsed, 16)
    },
    block2: {
      hash: header2.hash,
      number: parseInt(header2.number, 16),
      timestamp: parseInt(header2.timestamp, 16),
      gasUsed: parseInt(header2.gasUsed, 16)
    },
    comparison: {
      blockDifference: parseInt(header2.number, 16) - parseInt(header1.number, 16),
      timeDifference: parseInt(header2.timestamp, 16) - parseInt(header1.timestamp, 16),
      gasUsedDifference: parseInt(header2.gasUsed, 16) - parseInt(header1.gasUsed, 16)
    }
  };
};

// Track block ancestry
const getBlockAncestry = async (blockHash, generations = 5) => {
  const ancestry = [];
  let currentHash = blockHash;
  
  for (let i = 0; i < generations; i++) {
    const header = await getHeaderByHash(currentHash);
    
    if (!header) break;
    
    ancestry.push({
      generation: i,
      hash: header.hash,
      number: parseInt(header.number, 16),
      parentHash: header.parentHash,
      timestamp: parseInt(header.timestamp, 16)
    });
    
    currentHash = header.parentHash;
    
    // Stop if we reach the genesis block
    if (currentHash === '0x0000000000000000000000000000000000000000000000000000000000000000') {
      break;
    }
  }
  
  return ancestry;
};

// Usage
const blockHash = '0x2ce91ae0ed242b4b78b432a45b982fb81a414d6b04167762ed3c7446710a4b8e';

validateBlockHash(blockHash).then(result => {
  if (result.valid) {
    console.log(`Block ${result.blockNumber} found:`, result.header);
  } else {
    console.log('Block validation failed:', result.error);
  }
});

getBlockAncestry(blockHash, 3).then(ancestry => {
  console.log('Block ancestry:', ancestry);
});

​
Example request

Shell
curl -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getHeaderByHash",
    "params": [
      "0x2ce91ae0ed242b4b78b432a45b982fb81a414d6b04167762ed3c7446710a4b8e"
    ],
    "id": 1
  }' \
  https://hyperliquid-mainnet.core.chainstack.com/4f8d8f4040bdacd1577bff8058438274/evm

​
Use cases

The eth_getHeaderByHash method is useful for applications that need to:
  • Block validation: Validate specific blocks by hash without downloading transaction data
  • Chain analysis: Analyze blockchain structure and block relationships
  • Block verification: Verify block integrity and metadata
  • Ancestry tracking: Track parent-child relationships between blocks
  • Fork detection: Detect and analyze blockchain forks
  • Block comparison: Compare metadata between different blocks
  • Historical analysis: Analyze historical block data efficiently
  • Mining analytics: Analyze mining patterns and block characteristics
  • Network forensics: Investigate specific blocks in network analysis
  • Block explorers: Provide detailed block information by hash
  • Audit tools: Build blockchain audit tools with block verification
  • Chain synchronization: Implement selective chain synchronization
  • Performance analysis: Analyze block timing and gas usage patterns
  • Security analysis: Analyze suspicious or specific blocks
  • Research tools: Support blockchain research with block-level data
This method provides direct access to block header information using block hashes, enabling precise blockchain analysis and verification on the Hyperliquid EVM platform.

Body

application/json
​
jsonrpc
enum<string>
default:2.0
required

JSON-RPC version

Available options:
2.0
​
method
enum<string>
default:eth_getHeaderByHash
required

The RPC method name

Available options:
eth_getHeaderByHash
​
params
array
required

Parameters: [block_hash]

​
id
integer
default:1
required

Request identifier

Response

200 - application/json

Successful response with block header information

​
jsonrpc
string

JSON-RPC version

​
id
integer

Request identifier

​
result
object

Block header information or null if not found

Last modified on October 19, 2025