Is web3 a solution looking for a problem? 

Or did it start with a customer’s needs and the technology followed?

Which non-speculative use cases do you bring up when these questions arise?

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Well, for one, NFTs (and their adjacent tech) are an actual solution to multiple real-world problems that have plagued the fine art world for centuries.

Examples: accessing markets and audiences, archiving, authenticity/detecting forgeries, provenance, and compiling an artist’s catalogue raisonné.