I received a couple of arx's HaLo Chips back in January to conduct a research how actually a physical backed tokens can be done as EIP-5791 was just dropped 3 months before.

I don't hear much about the project and so I decided to contribute a little to the project. This project is highly inspired by PBT itself.

The flow to mint the token itself is actually pretty simple.

1. Seed the chip
2. Generate signature
3. Mint
4. ???
5. Profit

This repository is intended only as a demo, the code (both the contract and the frontend) need a lot of adjustment before it is ready to ship to the production.

There are two ways to set up the environment variables. As you may see, the repository is a combination of Next.js and Foundry project. You can choose whether you'd run only the Next.js, smart contract (with Foundry), or both.

The essential environment variables for Next.js project are NEXT_PUBLIC_CONTRACT_ADDRESS for deployed contract address and NEXT_PUBLIC_WALLET_CONNECT_PROJECTID. It should have NEXT_PUBLIC_ prefix otherwise it won't accessible to the browser. You can use your own contract address or or the one I deployed on Sepolia at 0x3b09Ba02807d628533ca39e491bCbcFf264ba5C8.

On the contrary, the environment variables for the smart contract is pretty straightforward. There's PRIVATE_KEY to deploy the smart contract, ETHERSCAN_API_KEY to verify the smart contract on Etherscan, and SEPOLIA_RPC_URL.

Put them all in .env file and you're good.

After installing the dependencies with npm install, you can run the development server with:

npm run dev
# or
yarn dev
# or
pnpm dev

As of now there's no test cases for the Next.js, but you can test the smart contract with forge test.

Contributing is very welcome. You can fork the repository, give the changes on your end, and open a pull request.