Optimism Smart Contracts (Bedrock)

This package contains the smart contracts that compose the on-chain component of Optimism's upcoming Bedrock upgrade. We've tried to maintain 100% backwards compatibility with the existing system while also introducing new useful features. You can find detailed specifications for the contracts contained within this package here.

A style guide we follow for writing contracts can be found here.

Contracts Overview

Contracts deployed to L1

| Name | Proxy Type | Description | | ---------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- | | L1CrossDomainMessenger | ResolvedDelegateProxy | High-level interface for sending messages to and receiving messages from Optimism | | L1StandardBridge | L1ChugSplashProxy | Standardized system for transferring ERC20 tokens to/from Optimism | | L2OutputOracle | Proxy | Stores commitments to the state of Optimism which can be used by contracts on L1 to access L2 state | | OptimismPortal | Proxy | Low-level message passing interface | | OptimismMintableERC20Factory | Proxy | Deploys standard OptimismMintableERC20 tokens that are compatible with either StandardBridge | | ProxyAdmin | - | Contract that can upgrade L1 contracts |

Contracts deployed to L2

| Name | Proxy Type | Description | | ---------------------------------------------------------------------------------------- | ------------------------------------------ | ------------------------------------------------------------------------------------------------ | | GasPriceOracle | Proxy | Stores L2 gas price configuration values | | L1Block | Proxy | Stores L1 block context information (e.g., latest known L1 block hash) | | L2CrossDomainMessenger | Proxy | High-level interface for sending messages to and receiving messages from L1 | | L2StandardBridge | Proxy | Standardized system for transferring ERC20 tokens to/from L1 | | L2ToL1MessagePasser | Proxy | Low-level message passing interface | | SequencerFeeVault | Proxy | Vault for L2 transaction fees | | OptimismMintableERC20Factory | Proxy | Deploys standard OptimismMintableERC20 tokens that are compatible with either StandardBridge | | L2ProxyAdmin | - | Contract that can upgrade L2 contracts when sent a transaction from L1 |

Legacy and deprecated contracts

| Name | Location | Proxy Type | Description | | --------------------------------------------------------------- | -------- | ------------------------------------------ | ------------------------------------------------------------------------------------- | | AddressManager | L1 | - | Legacy upgrade mechanism (unused in Bedrock) | | DeployerWhitelist | L2 | Proxy | Legacy contract for managing allowed deployers (unused since EVM Equivalence upgrade) | | L1BlockNumber | L2 | Proxy | Legacy contract for accessing latest known L1 block number, replaced by L1Block |

Installation

We export contract ABIs, contract source code, and contract deployment information for this package via npm:

npm install @eth-optimism/contracts-bedrock

Contributing

For all information about working on and contributing to Optimism's smart contracts, please see CONTRIBUTING.md

Deployment

The smart contracts are deployed using foundry with a hardhat-deploy compatibility layer. When the contracts are deployed, they will write a temp file to disk that can then be formatted into a hardhat-deploy style artifact by calling another script.

Configuration

Create or modify a file <network-name>.json inside of the deploy-config folder. By default, the network name will be selected automatically based on the chainid. Alternatively, the DEPLOYMENT_CONTEXT env var can be used to override the network name. The spec for the deploy config is defined by the deployConfigSpec located inside of the hardhat.config.ts.

Execution

1. Set the env vars ETH_RPC_URL, PRIVATE_KEY and ETHERSCAN_API_KEY if contract verification is desired
2. Deploy the contracts with forge script -vvv scripts/Deploy.s.sol:Deploy --rpc-url $ETH_RPC_URL --broadcast --private-key $PRIVATE_KEY Pass the --verify flag to verify the deployments automatically with Etherscan.
3. Generate the hardhat deploy artifacts with forge script -vvv scripts/Deploy.s.sol:Deploy --sig 'sync()' --rpc-url $ETH_RPC_URL --broadcast --private-key $PRIVATE_KEY

Deploying a single contract

All of the functions for deploying a single contract are public meaning that the --sig argument to forge script can be used to target the deployment of a single contract.