> ## Documentation Index
> Fetch the complete documentation index at: https://docs.allium.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Blocks

Blocks are the building blocks of blockchains and rollups.

A block contains transactions which will alter the state of an EVM system incrementally. Transaction within a block can only be executed one after the other, not in parallel.

### Table Columns

Unique Key: number

| Column Name         | Description                                                                                                                                    |
| ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| number              | The length of the chain, in blocks.                                                                                                            |
| timestamp           | The unix timestamp for when the block was collated.                                                                                            |
| hash                | Unique identifier of a transaction.                                                                                                            |
| parent\_hash        | Unique identifier of the block preceding this block, also known as the parent block.                                                           |
| nonce               | [The transaction nonce, unique to the wallet](https://ethereum.org/en/glossary/#nonce)                                                         |
| sha3\_uncles        | An array of uncle hashes.                                                                                                                      |
| logs\_bloom         | The bloom filter for the logs of the block.                                                                                                    |
| state\_root         | The root of the final state trie of the block.                                                                                                 |
| receipts\_root      | The root of the receipts trie of the block.                                                                                                    |
| miner               | The address of the beneficiary to whom the mining rewards were given                                                                           |
| difficulty          | The integer of the difficulty for this block.                                                                                                  |
| total\_difficulty   | The integer of the total difficulty of the chain until this block.                                                                             |
| size                | The size of the block, in bytes, as determined by the gas\_limit.                                                                              |
| extra\_data         | The "extra data" field of this block.                                                                                                          |
| gas\_limit          | Gas limit of the current block.                                                                                                                |
| gas\_used           | Total gas used in the block.                                                                                                                   |
| base\_fee\_per\_gas | Post London Upgrade (EIP1559), this represents the minimum gas\_used required for a transaction to be included in a block. Represented in wei. |
| transaction\_count  | Number of transactions included in this block.                                                                                                 |
| transactions\_root  | The root of the transaction trie of the block.                                                                                                 |
| \_created\_at       | Timestamp of the entry creation.                                                                                                               |
| \_updated\_at       | Timestamp of the entry update.                                                                                                                 |