[jobigoud]

> NFTs help prove ownership without needing a central authority (which is a big deal)

The same artwork or membership card or movie ticket can be wrapped in multiple NFT, each living on a different blockchain or on the same blockchain but in different contracts.

Hence you still need the central authority saying which chain is the true one. For example if the NFT represent a plot of virtual land, the game or software managing that land acts as the central authority.