There are currently 7 core smart contracts that are always deployed on each chain. These are responsible for the vital functions of the chain and provide infrastructure for all other smart contracts:
root: Responsible for the initialization of the chain, maintains registry of deployed contracts.
accounts: Manages the on-chain ledger of accounts.
blob: Responsible for the registry of binary objects of arbitrary size.
blocklog: Keeps track of the blocks and receipts of requests that were processed by the chain.
governance: Handles the administrative functions of the chain. For example: rotation of the committee of validators of the chain, fees and other chain-specific configurations.
errors: Keeps a map of error codes to error messages templates. These error codes are used in request receipts.
evm: Provides the necessary infrastructure to accept Ethereum transactions and execute EVM code.