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The system configuration is a set of configurable chain parameters defined in a contract on L1. These parameters can be changed through the system config contract, emitting events that are picked up by the [rollup node derivation process][derivation]. To dive deeper into the System Config, visit the OP Stack Specifications.

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SystemConfig Type

The SystemConfig type is defined in kona-genesis. Parameters defined in the SystemConfig are expected to be updated through L1 receipts, using the update_with_receipts method.

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Holocene Updates

The Holocene Hardfork introduced an update to the SystemConfig type, adding EIP-1559 parameters to the config. The SystemConfig type in kona-genesis provides a method called eip_1559_params that returns the EIP-1559 parameters encoded as a B64.