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Chain Configuration

Networks​

NetworkChain IDBlock ExplorerRPC Endpoint
Testnet13473https://explorer.testnet.immutable.com/http://rpc.testnet.immutable.com
MainnetTBDTBDETA Q1 2024

Configuration​

ParameterDescriptionValueImportance
Block Gas LimitThe maximum amount of gas available in a block.30,000,000Blocks include transactions that have a cumulative gas usage of less than or equal to the Block Gas Limit.
Block Gas TargetDeviation from this target will adjust the base fee in the subsequent block.Block Gas Limit / 2If the size of the current block is above or below this target, then the base fee of the next block increase or decrease up to the Base Fee Rate of Change.
Base Fee Rate of ChangeThe maximum rate to adjust the base fee, increasing it when the network is congested and decreasing it when it's under-utilized, to maintain an equilibrium of block space demand i.e. the Block Gas Target. See EIP-1559.2%The gas cost of a transaction will increase or decrease up to this rate depending on how congested the chain is.
Block PeriodThe minimum time transactions are sealed into a child chain block.2 secondsThis is a key input to block finality.

Allow and blocklists​

While these are separate pieces of configuration, the following are our two gating lists:

  1. Contract allowlist - This ACL will only apply to Mainnet. Initially, we will limit which wallets can deploy a contract on the chain. We will do this as a quality control measure and to conserve network bandwidth while the first set of Games and developers are onboarding. The long-term plan is to open up the Immutable zkEVM chain.
  2. Transaction blocklist - This ACL will apply to Mainnet and Testnet. To comply with international regulations, we must block a list of wallet addresses from accessing the chain.