Arc 7 of 100 Days of Solana was about building NFTs from first principles. Instead of starting with marketplaces, profile pictures, or NFT culture, the arc stripped the model back to the underlying token mechanics: supply, decimals, mint authority, metadata, collections, and provenance. After Arc 6, we already knew that Token-2022 can turn tokens into programmable objects with rules: interest, fees, frozen accounts, credentials, revocation, and metadata. Arc 7 took that model into NFTs. But the