I have not seen any compelling project successfully bridge analog world content with digital signatures for blockchain purposes. These things always seem to req

I have not seen any compelling project successfully bridge analog world content with digital signatures for blockchain purposes. These things always seem to require some trusted party like a government to support them. That said, I suspect something along these lines may some day be the "killer app" that NFTs/smart contracts need but are currently missing. The scarcity of atoms combined with the public, immutable digital records on a blockchain ledger. Too bad we are 12+ years into the blockchain and I've yet to see a compelling use case.