Polkadot SDK's Parachain Template

This is a template for creating a parachain based on Polkadot SDK.

This template is automatically updated after releases in the main Polkadot SDK monorepo.

• ⏫ This template provides a starting point to build a parachain.

• ☁️ It is based on the Cumulus framework.

• 🔧 Its runtime is configured with a single custom pallet as a starting point, and a handful of ready-made pallets such as a Balances pallet.

• 👉 Learn more about parachains here

Template Structure

A Polkadot SDK based project such as this one consists of:

• 💿 a Node - the binary application.
• 🧮 the Runtime - the core logic of the parachain.
• 🎨 the Pallets - from which the runtime is constructed.

Getting Started

• 🦀 The template is using the Rust language.

• 👉 Check the Rust installation instructions for your system.

• 🛠️ Depending on your operating system and Rust version, there might be additional packages required to compile this template - please take note of the Rust compiler output.

Build

🔨 Use the following command to build the node without launching it:

cargo build --package parachain-template-node --release

🐳 Alternatively, build the docker image:

docker build . -t polkadot-sdk-parachain-template

Local Development Chain

🧟 This project uses Zombienet to orchestrate the relaychain and parachain nodes. You can grab a released binary or use an npm version.

This template produces a parachain node. You still need a relaychain node - you can download the polkadot (and the accompanying polkadot-prepare-worker and polkadot-execute-worker) binaries from Polkadot SDK releases.

Make sure to bring the parachain node - as well as polkadot, polkadot-prepare-worker, polkadot-execute-worker, and zombienet - into PATH like so:

export PATH="./target/release/:$PATH"

This way, we can conveniently use them in the following steps.

👥 The following command starts a local development chain, with a single relay chain node and a single parachain collator:

zombienet --provider native spawn ./zombienet.toml

# Alternatively, the npm version:
npx --yes @zombienet/cli --provider native spawn ./zombienet.toml

Development chains:

• 🧹 Do not persist the state.
• 💰 Are preconfigured with a genesis state that includes several prefunded development accounts.
• 🧑‍⚖️ Development accounts are used as validators, collators, and sudo accounts.

Connect with the Polkadot-JS Apps Front-End

• 🌐 You can interact with your local node using the hosted version of the Polkadot/Substrate Portal: relay chain and parachain.

• 🪐 A hosted version is also available on IPFS.

• 🧑‍🔧 You can also find the source code and instructions for hosting your own instance in the polkadot-js/apps repository.

Contributing

• 🔄 This template is automatically updated after releases in the main Polkadot SDK monorepo.

• ➡️ Any pull requests should be directed to this source.

• 😇 Please refer to the monorepo's contribution guidelines and Code of Conduct.

Getting Help

• 🧑‍🏫 To learn about Polkadot in general, Polkadot.network website is a good starting point.

• 🧑‍🔧 For technical introduction, here are the Polkadot SDK documentation resources.

• 👥 Additionally, there are GitHub issues and Substrate StackExchange.