Juno is a golang Starknet node implementation by Nethermind with the aim of decentralising Starknet.

⚙️ Installation

Prerequisites

• Golang 1.20 or higher is required to build and run the project. You can find the installer on the official Golang download page.
• Rust.
• A C compiler: gcc or clang.

Build and Run

make juno
./build/juno

Use the --help flag for configuration information. Flags and their values can also be placed in a .yaml file that is passed in through --config.

Run with Docker

To run Juno with Docker, use the following command. Make sure to create the /home/juno directory on your local machine before running the command.

docker run -d \
  --name juno \
  -p 6060:6060 \
  -v /home/juno:/var/lib/juno \
  nethermind/juno \
  --http-port 6060 \
  --db-path /var/lib/juno \
  --eth-node <YOUR-ETH-NODE>

You should replace <YOUR-ETH-NODE> with your actual Ethereum node address. If you're using Infura, your Ethereum node address might look something like: wss://mainnet.infura.io/ws/v3/your-infura-project-id. Make sure you are using the websocket URL ws/wss and not the http URL http/https.

To view logs from the Docker container, use the following command:

docker logs -f juno

📸 Snapshots

Use the provided snapshots to quickly sync your Juno node with the current state of the network.

Mainnet

Version	Size	Block	Download Link
>=v0.4.0	29.4 GB	100713	juno_mainnet_100713.tar
>=v0.4.0	36.5 GB	136902	juno_mainnet_136902.tar

Goerli

Version	Size	Block	Download Link
>=v0.4.0	31.6 GB	830385	juno_goerli_830385.tar
>=v0.4.0	32.3 GB	839969	juno_goerli_839969.tar

Goerli2

Version	Size	Block	Download Link
>=v0.4.0	1.8 GB	125026	juno_goerli2_125026.tar
>=v0.4.0	4.5 GB	135973	juno_goerli2_135973.tar

✔ Supported Features

• Starknet v0.12.0 support.
• JSON-RPC v0.3.0:
  • starknet_chainId
  • starknet_blockNumber
  • starknet_blockHashAndNumber
  • starknet_getBlockWithTxHashes
  • starknet_getBlockWithTxs
  • starknet_getTransactionByHash
  • starknet_getTransactionReceipt
  • starknet_getBlockTransactionCount
  • starknet_getTransactionByBlockIdAndIndex
  • starknet_getStateUpdate
  • starknet_getNonce
  • starknet_getStorageAt
  • starknet_getClassHashAt
  • starknet_getClass
  • starknet_getClassAt
  • starknet_syncing
  • starknet_getEvents
  • starknet_call
  • starknet_estimateFee
  • starknet_addInvokeTransaction
  • starknet_addDeclareTransaction
  • starknet_addDeployAccountTransaction
• Juno's JSON-RPC:
  • juno_version
  • juno_getTransactionStatus
• Integration of CairoVM.
• Verification of State from L1.
• Handle L1 and L2 Reorgs.
• Starknet state construction and storage using a path-based Merkle Patricia trie.
• Feeder gateway synchronisation of Blocks, Transactions, Receipts, State Updates and Classes.
• Block and Transaction hash verification.

🛣 Roadmap

Phase 1

• Flat DB implementation of trie
• Go implementation of crypto primitives
  • Pedersen hash
  • Starknet_Keccak
  • Felt
• Feeder gateway synchronisation
  • State Update
  • Blocks
  • Transactions
  • Class
• Implement the following core data structures, and their Hash calculations
  • Blocks
  • Transactions and Transaction Receipts
  • Contracts and Classes
• Storing blocks, transactions and State updates in a local DB
• Basic RPC (in progress)
  • starknet_chainId
  • starknet_blockNumber
  • starknet_blockHashAndNumber
  • starknet_getBlockWithTxHashes
  • starknet_getBlockWithTxs
  • starknet_getTransactionByHash
  • starknet_getTransactionReceipt
  • starknet_getBlockTransactionCount
  • starknet_getTransactionByBlockIdAndIndex
  • starknet_getStateUpdate

Phase 2

The focus of Phase 2 will be to Verify the state from layer 1 and implement the remaining JSON-RPC endpoints.

• Starknet v0.11.0 support
  • Poseidon state trie support
• Blockchain: implement blockchain reorganization logic.
• Synchronisation: implement verification of state from layer 1.
• JSON-RPC API v0.3.0:
  • Implement the remaining endpoints:
    • starknet_syncing
    • starknet_getNonce
    • starknet_getStorageAt
    • starknet_getClassHashAt
    • starknet_getClass
    • starknet_getClassAt
    • starknet_getEvents
• Integration of CairoVM:
  • starknet_call
  • starknet_estimateFee
• JSON-RPC Write API v0.3.0:
  • starknet_addInvokeTransaction
  • starknet_addDeclareTransaction
  • starknet_addDeployAccountTransaction

👍 Contribute

We welcome PRs from external contributors and would love to help you get up to speed. Let us know you're interested in the Discord server and we can discuss good first issues. There are also many other ways to contribute. Here are some ideas:

• Run a node.
• Add a GitHub Star to the project.
• Tweet about Juno.
• Add a Github issue if you find a bug, or you need or want a new feature.

🤝 Partnerships

To establish a partnership with the Juno team, or if you have any suggestion or special request, feel free to reach us via email.

⚠️ License

Copyright (c) 2022-present, with the following contributors.

Juno is open-source software licensed under the Apache-2.0 License.