Appchain development with the Polkadot SDK

# Bounty Title + Description **Bounty Title** Appchain development with the Polkadot SDK **Bounty Category** Launch an MVP on Testnet or Mainnet **Bounty Description** The Polkadot SDK -- used by builders of over 50 layer-1 chains secured by Polkadot as well as other projects outside of Polkadot such as Madara (Starknet), Midnight (Cardano) and Polygon Avail -- is a powerful open source SDK that allows teams to build custom blockchains. For this bounty, we invite #BUIDLers to design and submit an appchain POC implementation using the Polkadot SDK. # Bounty Awards + Prizes ## Prize Pool **Prize Amount** $4,000.00 **Number of Projects Awarded** 1 project **Winner Breakdown** The winning submission gets $4,000. If the judges find that no project is good enough to win, they'll be sure to explain why. The top 10 submissions will be considered for a fast track interview to the Polkadot Blockchain Academy and get support from Square One. **Grant Program Opportunities** Support from Square One (Substrate Builder's Program) and W3F grants. # Bounty Guidance **What is required to complete this prize?** - **Code submission:** can be either your own clone of the extended parachain template with your custom pallets, a repository of the your custom pallets or a clone of an existing appchain you've extended - **README file:** A description of the design of your appchain including the service it provides, it’s intended use and your plans to deploy it to production - **Demo:** Short 2-minute video walking through your appchain logic and if possible, a demonstration of it using the Polkadot JS Apps UI - **Bonus**: Teams who register their appchain to be deployed on the Rococo testnet or Kusama mainnet - **Bonus**: Teams who demonstrate the use of XCM and use more than one appchain in their demo **What does success look like? What are possible features that you are looking for?** We're looking for a working proof of concept that could become deployed to Polkadot. Successful submissions are ones that: - Provide a unique service to the Polkadot network and its existing parachains - Identify and meet a need for Polkadot's end-users and ecosystem agents Teams will have integrated their custom appchain pallets into a parachain template and will provide a clear demonstration of its use as a POC and plans for future development. For example, if a team decides to implement a new collective on the Collectives chain, the submission would include an appchain with the existing logic of the [Collectives chain](https://github.com/polkadot-fellows/runtimes/tree/main/system-parachains/collectives/collectives-polkadot), plus the new pallet(s) for the implementation of the proposed collective logic and its intended use. **What are the UI/UX Design Requirements** The submission must include steps to run the appchain as part of a local testnet or in a Docker container along with clear instructions on the intended use of all callable functions the appchain exposes. **How are you judging this bounty? What specific criteria do projects needs to be aware of?** Your submission will be judged on the following: * **Implementation and working node**: does your code work? how well does your implementation reflect your design goals? * **Novelty of idea**: how unique is your appchain? how is it adding value to Polkadot? * **Business case**: what purpose does your appchain solve and do you have a good business case for it? **What is the impact on your organization by a team working on this bounty?** You'll be adding new services to the Polkadot network, adding new utility for users and exploring what Polkadot can offer for deploying your web3 application ideas. # Bounty Resources For a complete list of resources, check out [this dedicated page](https://github.com/sacha-l/polkadot-bounty-resources). Here are some resources that'll help you get started: * Learn about Polkadot appchains: https://wiki.polkadot.network/docs/learn-parachains-index * What Polkadot provides developers: https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/polkadot_sdk/polkadot/ * Polkadot SDK reference documentation: https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/reference_docs **What are examples of use cases you are looking to solve?** For this bounty we invite you to create a custom appchain. Though your submission may not be ready for production, this challenge seeks submissions of proof of concepts with have a clear idea for an appchain that can benefit the Polkadot ecosystem. These may get your creative juices flowing: * Recreate the logic of a popular L1 or L2 from another ecosystem * Implement the logic of an existing dApp as it’s own appchain * Extend the core logic of an existing system chain