Per a cursory question on the Goog I got: 95% of collections are now considered worthless.

I worked at a blockchain startup back in the day and despite the PTSD of working with insane people, I appreciate the concept of the blockchain. I've yet to see any mainstream value in it. Sure bitcoin is worth a lot but it's not because of the inherent value of blockchain finance, it's because there's too much money out there and everybody loves a fat bubble asset.

I never got what would blockchain do better except maybe distribution. And even there raise questions of efficiency of having data copied in a lot of places.

Correcting data is also always fun question. Your keys are stolen, now your house is not yours anymore as record is immutable. Oh it is not actually immutable if someone says it is not (replace it with new record )? What was the point again...