Can someone please explain the specifics of how NFT metadata is stored (both on and off chain examples?) and how it's called by apps like Opensea or Decentlraland?
Additionally, would it be especially challenging to utilize dynamic metadata for an NFT, which updates regularly based on changing smart contract variables, which themselves change due to user interactions with the smart contracts? E.g. imagine an updatable "Countdown" NFT where the jpeg shows a picture of the integer "days until X", which updates each day as time passes but can also updated based on changing X in the NFT smart contacts... made this up on the spot but actually an interesting idea? :)
Is this doable? Are there storage challenges? Do apps call metadata repeatedly or would they call it once and never reflect updates?
