I've been able to find references to pilot programs in Sweden, Ukraine, and Georgia (the country), but is there anywhere that's actually adopted it such that a blockchain-based registry has the same force of law that a traditional registry has?
I'm particularly curious how a registry would handle an “I lost my private key” scenario. As I see it, either the blockchain is absolute and losing keys would mean losing the land, or there's another authority who can override the blockchain's version of the truth. In the latter case, it kind of obliterates the advantages of a blockchain.