I highly doubt nostr’s suitability as a petabyte DFS/CDN.
As nostr relies on gossip, there is no guarantee you will have access to latest address.
But if you are going to build some nostr-based “resolver” into a browser you could instead use any of the other protocols - 2 of which are designed specifically for resolution, and the other already having a robust resolver implementation built on top of it?
I quite like nostr, but let’s not pretend it solves every problem.