There is a second use-case (outside the "digital cash") that actually makes some technical sense. It's possible to use a blockchain as a distributed identity s

There is a second use-case (outside the "digital cash") that actually makes some technical sense. It's possible to use a blockchain as a distributed identity store, where people prove their ownership of an address by signing with the private key. This is an interesting application because it's an ownerless identity system that works because of the distributed consensus mechanism.