1/ Not many, but a few. The big question is whether anyone has a use case for blockchain that couldn’t be solved at least as well, if not better, with established (mature, supportable) tech.

So far I haven’t seen any examples https://twitter.com/jgreco/status/1362542495255691269

2/ Lots of examples of companies automating trading of some illiquid asset of one kind or another... but we have been able to automate trading for decades. Nothing new here.

3/ ASX is replacing CHESS, but that’s a pretty low bar to clear since CHESS is ancient. And the blockchain replacement for CHESS does nothing that couldn’t be done (better/faster/cheaper) with MySQL. After all, it’s a CENTRAL Securities Depository.

4/ In fact, good luck finding a blockchain implementation that doesn’t find some party acting as an intermediary/utility, which defeats any benefit from a distributed ledger. Every one has someone operating the service (eg IBM)

5/ Bottom line: It can be made to work, but it isn’t the best solution for anything, and hasn’t solved any real world problems that weren’t already solved.