Optimism is a low-cost and lightning-fast Ethereum L2 blockchain, built with the OP Stack.

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Celestia is a modular consensus and data network, built to enable anyone to easily deploy their own blockchain with minimal overhead.

Celestia + OP Stack tutorial

If you're looking to run the OP Stack + Celestia setup for this repository, please visit the Optimism & Celestia guides and tutorials to get started.

What are Optimism and the OP Stack?

Optimism is a low-cost and lightning-fast Ethereum L2 blockchain, but it's also so much more than that.

The OP Stack powers Optimism, an Ethereum L2 blockchain, and forms the technical foundation for the the Optimism Collectivea group committed to the impact=profit principle. This principle rewards individuals for their positive contributions to the collective.

Optimism addresses critical coordination failures in the crypto ecosystem, such as funding public goods and infrastructure. The OP Stack focuses on creating a shared, open-source system for developing new L2 blockchains within the proposed Superchain ecosystem, promoting collaboration and preventing redundant efforts.

As Optimism evolves, the OP Stack will adapt, encompassing components ranging from blockchain infrastructure to governance systems. This software suite aims to simplify L2 blockchain creation while supporting the growth and development of the Optimism ecosystem.

What is Celestia?

Celestia is a modular consensus and data network, built to enable anyone to easily deploy their own blockchain with minimal overhead.

Celestia is a minimal blockchain that only orders and publishes transactions and does not execute them. By decoupling the consensus and application execution layers, Celestia modularizes the blockchain technology stack and unlocks new possibilities for decentralized application builders. Lean more at Celestia.org.

Maintenance

The maintenance guide for this repository can be found in the Wiki tab of the repository or here.

Documentation

If you want to build on top of Celestia, take a look at the documentation at docs.celestia.org.

If you want to learn more about the OP Stack, check out the documentation at stack.optimism.io.

Community

Optimism

General discussion happens most frequently on the Optimism discord. Governance discussion can also be found on the Optimism Governance Forum.

Celestia

General discussion happens most frequently on the Celestia discord. Other discussions can be found on the Celestia forum.

e2e testing

This repository has updated end-to-end tests in the op-e2e package to work with Celestia as the data availability (DA) layer.

Currently, the tests assume a working Celestia devnet running locally:

bash docker run --platform linux/amd64 -p 26658:26658 ghcr.io/rollkit/local-celestia-devnet:v0.11.0-rc8

The e2e tests can be triggered with:

bash cd $HOME/optimism cd op-e2e make test

Bridging

If you have the OP Stack + Celestia setup running, you can test out bridging from the L1 to the L2.

To do this, first navigate to the packages/contracts-bedrock directory and create a .env file with the following contents:

bash L1_PROVIDER_URL=http://localhost:8545 L2_PROVIDER_URL=http://localhost:9545 PRIVATE_KEY=bf7604d9d3a1c7748642b1b7b05c2bd219c9faa91458b370f85e5a40f3b03af7

Then, run the following from the same directory:

bash npx hardhat deposit --network devnetL1 --l1-provider-url http://localhost:8545 --l2-provider-url http://localhost:9545 --amount-eth <AMOUNT> --to <ADDRESS>

Directory Structure

~~ Production ~~
 packages
    common-ts: Common tools for building apps in TypeScript
    contracts: L1 and L2 smart contracts for Optimism
    contracts-periphery: Peripheral contracts for Optimism
    core-utils: Low-level utilities that make building Optimism easier
    data-transport-layer: Service for indexing Optimism-related L1 data
    chain-mon: Chain monitoring services
    fault-detector: Service for detecting Sequencer faults
    message-relayer: Tool for automatically relaying L1<>L2 messages in development
    replica-healthcheck: Service for monitoring the health of a replica node
    sdk: provides a set of tools for interacting with Optimism
 batch-submitter: Service for submitting batches of transactions and results to L1
 bss-core: Core batch-submitter logic and utilities
 gas-oracle: Service for updating L1 gas prices on L2
 indexer: indexes and syncs transactions
 infra/op-replica: Deployment examples and resources for running an Optimism replica
 integration-tests: Various integration tests for the Optimism network
 l2geth: Optimism client software, a fork of geth v1.9.10  (deprecated for BEDROCK upgrade)
 l2geth-exporter: A prometheus exporter to collect/serve metrics from an L2 geth node
 op-exporter: A prometheus exporter to collect/serve metrics from an Optimism node
 proxyd: Configurable RPC request router and proxy
 technical-documents: audits and post-mortem documents

~~ BEDROCK upgrade - Not production-ready yet, part of next major upgrade ~~
 packages
    contracts-bedrock: Bedrock smart contracts. To be merged with ./packages/contracts.
 op-bindings: Go bindings for Bedrock smart contracts.
 op-batcher: L2-Batch Submitter, submits bundles of batches to L1
 op-e2e: End-to-End testing of all bedrock components in Go
 op-node: rollup consensus-layer client.
 op-proposer: L2-Output Submitter, submits proposals to L1
 ops-bedrock: Bedrock devnet work
 specs: Specs of the rollup starting at the Bedrock upgrade