The eth_getBlockByNumber method retrieves detailed information about a block by its number or using special block identifiers such as "latest". This essential method provides complete access to block data including transactions, gas usage, timestamps, and other crucial blockchain metrics, making it a fundamental tool for blockchain applications.

Use Cases

Real-time blockchain monitoring and data feeds
Transaction verification and confirmation tracking
Block explorers and analytics dashboards
Gas optimization research and fee analysis
Historical data analysis and time-series research
Network status evaluation and health metrics
Syncing verification and chain validation
Smart contract deployment confirmation
MEV (Maximal Extractable Value) research

Method Details

This method allows you to query blocks by their height in the chain or using predefined tags, with options to include full transaction objects or just hashes.

パラメータ:

blockNumberstring[required]

Block number in hex format or tags: latest, earliest, pending, safe, finalized

transaction_detail_flagboolean[required]

If true, returns full transaction objects; if false, returns only transaction hashes

返り値:

resultobject

A block object, or null if no block was found

baseFeePerGasstring

Base fee per gas in hexadecimal (post EIP-1559)

difficultystring

The difficulty for this block in hexadecimal

extraDatastring

Extra data field of this block

gasLimitstring

Maximum gas allowed in this block in hexadecimal

gasUsedstring

Total gas used by all transactions in hexadecimal

hashstring

Hash of the block, null if pending

logsBloomstring

Bloom filter for the logs, null if pending

minerstring

Address of the miner/validator

mixHashstring

256-bit hash in hexadecimal

noncestring

Hash of the proof-of-work, null if pending

numberstring

Block number in hexadecimal, null if pending

parentHashstring

Hash of the parent block

receiptsRootstring

Root of the receipts trie

sha3Unclesstring

SHA3 of the uncles data

sizestring

Size of this block in bytes (hexadecimal)

stateRootstring

Root of the final state trie

timestampstring

Unix timestamp when the block was collated

totalDifficultystring

Total difficulty of the chain until this block

transactionsarray

Array of transaction objects or hashes

transactionsRootstring

Root of the transaction trie

unclesarray

Array of uncle hashes

withdrawalsarray

Array of validator withdrawals (post EIP-4895)

withdrawalsRootstring

Merkle root of withdrawals (post EIP-4895)

Response Example

{
	"jsonrpc": "2.0",
	"id": 1,
	"result": {
		"baseFeePerGas": "0x41a2b3591",
		"difficulty": "0x0",
		"extraData": "0x556e697377617020426c6f636b20231242353045",
		"gasLimit": "0x1c9c380",
		"gasUsed": "0x189b1f1",
		"hash": "0x4f32106f6ac5b44248aeda10c3e718f1048ddc274629cd1897a0ff1f7926c41e",
		"logsBloom": "0xe54b0921498ad482b83...[truncated]",
		"miner": "0x690B9A9E9aa1C9dB991C7721a92d351Db4FaC990",
		"mixHash": "0x51c1b337d7ec2023e7bfd47907a1ee256668e46fb9feb0007c62f9bc2a8a19a7",
		"nonce": "0x0000000000000000",
		"number": "0x112a880",
		"parentHash": "0xeea8dce30e2d7c2a7ffe35b6fc2c60782f59a123ff2812e85bf4a49839c6d5a2",
		"receiptsRoot": "0x14a87619e588c1ef9f8c69fd8e3dff2a49b2c73f19871a74a7e1d97d67d00416",
		"sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
		"size": "0x1284d",
		"stateRoot": "0xb87823a3aea0dd94ffe84481962c8f988e3c2ffac98a9af2b81c1c3e4fcc6dc0",
		"timestamp": "0x65f0d46e",
		"totalDifficulty": "0xc70d815d562d3cfa955",
		"transactions": [
			"0x5a8b22ab3e70ee6ee4b15b48b1c88d8c01806a677ab8938c68dc4323cf51ae7a",
			"0x8d2fcaa1aef4f4f19aa35bf9d91b34e24902efcaf670953a0bf7e0a6dc585e53"
			// ... additional transaction hashes
		],
		"transactionsRoot": "0x39f9c7a211b008becd35bfbceaf186d564fcb737a9c026f8af7b5d89a8989143",
		"uncles": [],
		"withdrawals": [
			{
				"index": "0x57ca86",
				"validatorIndex": "0x17384",
				"address": "0xb9d7934878b5fb9610b3fe8a5e441e8fad7e293f",
				"amount": "0x12a05f200"
			}
			// ... additional withdrawals
		],
		"withdrawalsRoot": "0x36a75a6993b676f8196354ed14e3c77167b9ae823211706b30aa125c3a5dac28"
	}
}

Block Tag Meanings

latest: The most recently mined block (most common usage)
earliest: Genesis block (block 0)
pending: Currently pending block (transactions in the mempool)
safe: Latest block considered safe by network (finality in progress)
finalized: Latest block that has achieved finality (post-Merge)

Transaction Detail Flag

The second parameter determines how transaction data is returned:

false: Only transaction hashes are returned (more efficient for block scanning)
true: Complete transaction objects are returned (useful for detailed transaction analysis)

Key Block Fields Explained

number: The block number (height) in the chain
timestamp: Unix timestamp when the block was created (seconds since Jan 1, 1970)
gasUsed/gasLimit: Actual gas consumed vs. maximum allowed in this block
baseFeePerGas: Base fee per gas unit introduced in EIP-1559
difficulty: Always 0 after The Merge to proof-of-stake
miner: Address that received the block reward (validator in PoS)
withdrawals: Validator withdrawals available post-Shanghai upgrade

Practical Example

// Example of tracking block times and transaction volumes
async function analyzeNetworkActivity() {
	const latestBlock = await provider.send('eth_getBlockByNumber', ['latest', false]);
	const prevBlockNum = (parseInt(latestBlock.number, 16) - 100).toString(16);
	const prevBlock = await provider.send('eth_getBlockByNumber', [`0x${prevBlockNum}`, false]);

	// Calculate time between blocks
	const latestTime = parseInt(latestBlock.timestamp, 16);
	const prevTime = parseInt(prevBlock.timestamp, 16);
	const timespan = latestTime - prevTime;
	const avgBlockTime = timespan / 100;

	// Transaction volume
	const txCount = latestBlock.transactions.length;
	const gasUsed = parseInt(latestBlock.gasUsed, 16);

	console.log(`Average block time: ${avgBlockTime.toFixed(2)} seconds`);
	console.log(`Latest block transactions: ${txCount}`);
	console.log(`Gas used: ${gasUsed.toLocaleString()} units`);
}

eth_getBlockByNumber