Blockchain mathematically guarantees trust… for info stored on the blockchain. What guarantee do you have that this info matches things that happen in reality?

If you say: we need a social contract to ensure people update the blockchain, then I say: that defeats the purpose of the heavy lifting you need to mathematically guarantee info on the blockchain is genuine. Let's just have a social contact to pay the artist when appropriate.

I don't see what other way could exist to keep the blockchain and reality in sync.