🏗️ CraneChat (demo-chat)

An E2E encrypted chat with token gated group chats built on Oasis Sapphire with ROFL.

!! Disclaimer !!

This is a demo application and should not be used in production.

How It Works

CraneChat is a decentralized chat application that provides:

1. Token Gated Group Chats: Create groups that require members to hold specific token amounts on supported chains to join
2. Direct Messaging: Send encrypted messages directly to other users
3. E2E Encryption: All messages are encrypted using Oasis Sapphire's confidential smart contracts
4. ROFL Integration: Automated token balance verification using ROFL (Remote Offchain Fault-tolerant Logic)

The application consists of:

• Smart contracts deployed on Oasis Sapphire
• ROFL application for off-chain token balance verification
• Next.js frontend with Wagmi for web3 integration

Directory Structure

• / (root): Smart contracts (Hardhat project)
• app/: Next.js frontend
• rofl/: ROFL application

Setup

1. Install dependencies:

pnpm install
cd app
pnpm install

2. Configure environment variables:

cp .env.template .env

Running

1. Start the frontend development server:

cd app
pnpm dev

2. For local ROFL development:

Check the (rofl/README.md) for instructions on running the ROFL service.

3. Deploy contracts:

npx hardhat deploy --network sapphire-localnet

4. To populate test groups (optional):

npx hardhat populate --network sapphire-localnet --contract <CONTRACT_ADDRESS>