[WalterSear]

Since a blockchain can only be used to verify activity on itself, blockchains are poor replacements for anything but markets. Anything being done that has access to an environment mutually trusted by all parties has no need of a blockchain - you just access a database in that environment.

Moreover, there's no reason to run a blockchain on a trusted party - i.e. 'corporate' blockchains - for the same reason: since you already have to trust whoever is maintaining it, it can't verify anything new for you.

The only reason these things exist is the large amounts of capital available to anyone who can shoehorn a blockchain into their business model.