BabyRoll

Welcome to BabyRoll, an educational initiative brought to you by CyberAcademy and Oxorio.

Project Overview

ZK rollup is a layer 2 scaling solution for Ethereum and other blockchain platforms. It allows multiple transactions to be bundled together off-chain, reducing the load on the main chain and improving scalability and transaction throughput. BabyRoll provides a beginner-friendly environment to understand the fundamental concepts behind ZK rollup and its implementation using Circom.

How to Use

To get started with the BabyRoll project, follow these steps:

1. Clone the Repository:

git clone git@github.com:oxor-io/circom_workshop.git
cd circom_workshop

2. Explore the Code: Familiarize yourself with the project structure and existing codebase.

3. Completing Homework Tasks: The project includes several TODO tasks to enhance your understanding and skills. Your homework assignments are as follows:

• Prevent Replay Attack: Implement a solution to prevent replay attacks by adding a nonce to transactions.

• Overflow Check: Add an overflow check for the recipient's balance to prevent unintended behavior.

• Write Verifier Smart Contract: Write a verifier smart contract to validate the correctness of the ZK rollup proofs.

• Optional: MultyTx Rollup Support: If you are feeling adventurous, explore adding support for processing multiple transactions (MultyTx rollup). This task is optional but highly encouraged for a more comprehensive learning experience.

4. Script Commands: BabyRoll provides convenient script commands to simplify the development process. Here are the available commands:

• Run npm run generateTestInput: Create an input.json file with signal values for BabyRoll.

• Run npm run test circuit: Compile BabyRoll, generate a proof with input.json as signal values, and run the verification process.

• Run npm run solidityVerifier circuit: Create a verifier smart contract. Note: Ensure you have a file with a .zkey extension in the "build" folder (generated when you run npm run test circuit or npm run testNoPots circuit).

• Run npm run getCalldata: Generate calldata for the verifyProof function with the proofs you created earlier.

Resources

• Circom Documentation
• ZK Rollup Explained

Support

If you encounter any issues, have questions, or need assistance, please reach out to us in the issues section. Happy coding!