STORAGE

Moonbirds launched with tokenURI pointing at the project's off-chain metadata server, so neither the artwork nor the metadata was on chain. The project later wired a separate renderer into the original contract: traits in contract storage (SSTORE) and pixel layers in data contracts (SSTORE2), so tokenURI returns JSON metadata whose image is a BMP data URI. The animation_url points at an off-chain server, and an owner can switch a bird to off-chain PNG artwork.