This demonstrates an ERC1155/ERC2771 semi-fungible contract with meta transactions and token metadata stored on IPFS, as well as a gasless web app to initialize, view and mint new tokens.

Only local dev works for now. The deployment to testnets is waiting for updated 3.x GSN contracts (RelayHub/Forwarder) there, see the discussion on OpenGSN Discord server.

Tech:

• OpenZeppelin ERC1155
• OpenZeppelin ERC2771Context
• Gas Station Network
• Hardhat
• Next.js
• wagmi
• ipfs-http-client
• Infura IPFS gateway

Local dev

Copy sol/.env.example to sol/.env and web/.env.example to web/.env and fill in the missing env vars.

• yarn sol:node starts Hardhat Network
• yarn sol:gsn deploys GSN contracts, and starts a relay server
• yarn sol:deploy:localhost deploys TokenStore and WhitelistPaymaster contracts
• yarn web:dev starts Next.js app at http://localhost:3000