PFP WAR
PFP Pixel War is a collaborative game where the players use NFTs they own on L1 Ethereum mainnet to use them in L2 via Storage proofs and MUD. It's inspired from r/place by Reddit
Demo
About
PFP War is a collaborative experience in which participants place their NFT on pixel (or “tile”) on an online canvas of 2500 (50 x 50) pixel squares, and wait a certain amount of time before placing another. Technical motivations - Challenge to prove the ownership of an L1 NFT on L2 - Challenge to make this verifier a precompile in op-geth - Discovery and Stress test the MUD framework What have we done ? - Ethereum Merkle Patricia Trie proof verifier (Solidity smart-contract) - PFP War: A web game that uses our verifier (MUD React Client) - A op-geth precompile of this verifier (Go) More details on our project README : https://github.com/cometh-game/pixel-war/blob/master/README.md
How it's made
We made an autonomous world using MUD and Storage Proof verifier on OP-stack. About the Ethereum Merkle Patricia Trie proof verifier: The Ethereum state is a data structure (a modified Merkle Patricia Trie) which keeps all accounts (nonce, balance, codeHash, storageRoot) linked by hashes and reducible to a single root hash stored on the blockchain. - We developed the Solidity Library that verify the Merkle Patricia Trie (MPT) - We developed a precompile of this Lib About PFP War that use the MPT verifier and MUD framework We developed our project entirely with MUD / React. We have deployed our contracts with the MUD system and interacted with the hooks provided. - Really simplifies the work on the front-end - Some issues with the public testnet indexer - Great support from the MUD team - Ultra-simplified smart-contract dev and management - Binding between UI and contract state is really cool About Optimism and Storage proof - The implementation of the Ethereum Merkle Patricia Trie was an interesting tech challenge. - We deepened our understanding of EVM, precompiles and how the state is stored. The full feedback about our experiment is available here https://medium.com/@vincentlg/pfp-war-project-use-the-l1-state-on-optimism-l2-with-storage-proof-fc0124db7caf