> ## Documentation Index > Fetch the complete documentation index at: https://docs.base.org/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](./glossary#batch-inbox) | L1 address where [batcher transactions](./glossary#batcher-transaction) are posted | Static | | [Batcher Hash](./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 | [Guardian](#service-roles) | | Bond Withdrawal Delay | Time before dispute game bonds can be withdrawn. 1 day.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](./glossary#fee-scalars) | Markup on transactions relative to raw L1 data cost. Fee margin between 0%–50%. | [System Config Owner](#admin-roles) | | [Gas Limit](../protocol/consensus/derivation#system-configuration) | L2 block gas limit. ≤ 200,000,000 gas. | [System Config Owner](#admin-roles) | | [Genesis State](../protocol/execution/evm/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](../protocol/consensus/derivation). 1 or 2 seconds. | [L1 Proxy Admin](#admin-roles) | | [Sequencing Window Size](./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#DA-footprint-block-limit) | 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](./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](./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](../protocol/execution/evm/predeploys#overview) | | L2 ProxyAdmin Owner | [Aliased](./glossary.mdx#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](../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](./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](./glossary#unsafe-block-signer) | Signs unsafe/pre-submitted blocks at the P2P layer | [System Config Owner](#admin-roles) |