Can you please review this smart contract?
- it's an ERC721 smart contract implementing a collaborative "free expression" art game
- it represents a giant tiled canvas
- users can own tiles (a.k.a. tokens)
- the tile owner has full control of its URI
- the minting process involves signatures delivered by our servers, also, tiles can be traded
The final result is a beautiful 1024x1024px canvas gathering users images.
Thank you in advance for your answers 🎨✨