> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-roethke-b20-upgrade-pages.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuration

> Reference for Base Chain configuration parameters across consensus, policy, admin, and sequencer categories.

There are four categories of Base configuration:

* **Consensus Parameters**: Fixed at genesis or changeable through privileged accounts or protocol upgrades.
* **Policy Parameters**: Changeable without breaking consensus, within protocol-imposed constraints.
* **Admin Roles**: Accounts that can upgrade contracts, change role owners, or update protocol parameters. Typically cold/multisig wallets.
* **Service Roles**: Accounts used for day-to-day operations. Typically hot wallets.

## Consensus Parameters

| Parameter | Description | Administrator |
| - | - | - |
| [Batch Inbox Address](/specifications/reference/glossary#batch-inbox) | L1 address where [batcher transactions](/specifications/reference/glossary#batcher-transaction) are posted | Static |
| [Batcher Hash](/specifications/reference/glossary#batcher-hash) | Versioned hash of the authorized batcher sender(s) | [System Config Owner](#admin-roles) |
| Chain ID | Unique chain ID for transaction signature validation | Static |
| Proof Maturity Delay | Time between proving and finalizing a withdrawal. 1 day. | [L1 Proxy Admin](#admin-roles) |
| Respected Game Type | Game type `OptimismPortal` accepts for withdrawal finalization. Aggregate verifier (`621`). | [Guardian](#service-roles) |
| Bond Withdrawal Delay | Time before dispute game bonds can be withdrawn. 1 day. | Static |
| [Fee Scalar](/specifications/reference/glossary#fee-scalars) | Markup on transactions relative to raw L1 data cost. Fee margin between 0%–50%. | [System Config Owner](#admin-roles) |
| [Gas Limit](/specifications/base-protocol/consensus/derivation#system-configuration) | L2 block gas limit. ≤ 200,000,000 gas. | [System Config Owner](#admin-roles) |
| [Genesis State](/specifications/base-protocol/execution/predeploys#overview) | Initial chain state including all predeploy code and storage. Standard predeploys and preinstalls only. | Static |
| L2 Block Time | Interval at which L2 blocks are produced via [derivation](/specifications/base-protocol/consensus/derivation). 1 or 2 seconds. | [L1 Proxy Admin](#admin-roles) |
| [Sequencing Window Size](/specifications/reference/glossary#sequencing-window) | Max batch submission gap before L1 fallback triggers. 3,600 L1 blocks (12 hours at 12s L1 block time). | Static |
| Start Block | L1 block where `SystemConfig` was first initialized | [L1 Proxy Admin](#admin-roles) |
| Superchain Target | `SuperchainConfig` and `ProtocolVersions` addresses for cross-L2 config. Mainnet or Sepolia. | Static |
| Governance Token | OP governance token. Disabled. | n/a |
| [Operator Fee Params](/upgrades/isthmus/exec-engine#operator-fee) | Operator fee scalar and constant for fee calculation. Standard values are 0; non-zero for non-standard configurations such as op-succinct. | [System Config Owner](#admin-roles) |
| [DA Footprint Gas Scalar](/upgrades/jovian/exec-engine) | Scalar for DA footprint calculation | [System Config Owner](#admin-roles) |
| [Minimum Base Fee](/upgrades/jovian/exec-engine#minimum-base-fee) | Minimum base fee on L2 | [System Config Owner](#admin-roles) |

## Policy Parameters

| Parameter | Description | Administrator |
| - | - | - |
| [Data Availability Type](/specifications/reference/glossary#data-availability-provider) | Whether the batcher posts data as blobs or calldata. Ethereum (Blobs or Calldata); Alt-DA not supported. | [Batch Submitter](#service-roles) |
| Batch Submission Frequency | Frequency of [batcher transaction](/specifications/reference/glossary#batcher-transaction) submissions to L1. ≤ 1,800 L1 blocks (6 hours at 12s L1 block time). | [Batch Submitter](#service-roles) |
| Output Frequency | Frequency of output root submissions to L1. ≤ 43,200 L2 blocks (24 hours at 2s L2 block time); must be non-zero. Deprecated once fault proofs are enabled. | [L1 Proxy Admin](#admin-roles) |

## Admin Roles

| Role | Description | Administers |
| - | - | - |
| L1 Proxy Admin | `ProxyAdmin` from the latest `op-contracts` release, authorized to upgrade L1 contracts | L1 contracts |
| L1 ProxyAdmin Owner | Authorized to update the L1 Proxy Admin. [0x5a0Aae59D09fccBdDb6C6CcEB07B7279367C3d2A](https://etherscan.io/address/0x5a0Aae59D09fccBdDb6C6CcEB07B7279367C3d2A) | [L1 Proxy Admin](#admin-roles) |
| L2 Proxy Admin | `ProxyAdmin` at `0x4200000000000000000000000000000000000018`, authorized to upgrade L2 contracts | [Predeploys](/specifications/base-protocol/execution/predeploys#overview) |
| L2 ProxyAdmin Owner | [Aliased](/specifications/reference/glossary#address-aliasing) L1 ProxyAdmin Owner; upgrades L2 contracts via `ProxyAdmin`. [0x6B1BAE59D09fCcbdDB6C6cceb07B7279367C4E3b](https://optimistic.etherscan.io/address/0x6B1BAE59D09fCcbdDB6C6cceb07B7279367C4E3b) | [L2 Proxy Admin](#admin-roles) |
| [System Config Owner](/specifications/base-protocol/consensus/derivation#system-configuration) | Authorized to change values in the `SystemConfig` contract | [Batch Submitter](#service-roles), [Sequencer P2P Signer](#service-roles), Fee Scalar, Gas Limit |

## Service Roles

| Role | Description | Administrator |
| - | - | - |
| [Batch Submitter](/specifications/reference/glossary#batcher) | Authenticates batches submitted to L1 | [System Config Owner](#admin-roles) |
| Challenger | Interacts with permissioned dispute games. [0x9BA6e03D8B90dE867373Db8cF1A58d2F7F006b3A](https://etherscan.io/address/0x9BA6e03D8B90dE867373Db8cF1A58d2F7F006b3A) | [L1 Proxy Admin](#admin-roles) |
| Guardian | Pauses L1 withdrawals, blacklists dispute games, sets respected game type in `OptimismPortal`. [0x09f7150D8c019BeF34450d6920f6B3608ceFdAf2](https://etherscan.io/address/0x09f7150D8c019BeF34450d6920f6B3608ceFdAf2) | [L1 Proxy Admin](#admin-roles) |
| Proposer | Creates permissioned dispute games on L1. | [L1 Proxy Admin](#admin-roles) |
| [Sequencer P2P Signer](/specifications/reference/glossary#unsafe-block-signer) | Signs unsafe/pre-submitted blocks at the P2P layer | [System Config Owner](#admin-roles) |