Most definitely. It has to be known before it can be used, but it has to be developed before it can be known. That's the stage we're at now.

As well, I think we would need to distinguish between personal keys and legal entity keys, not technically but in practice. I as a legal entity would be making a listing, purchase, or whatever other action on the one npub, and I wouldn't want spicy memes to be on the same npub as my home purchase or whatever.

Now, it would be the same system, because sharing a listing from the market side to my personal npub would still be a good functionality.

I think the "administrator" of such a system would be local gov't. Key rotation would be ... key 👈😉 ... to ensure individual liberty, while some continuity from key to key would then be necessary for local law enforcement to ensure the laws of real estate (and other) sales are followed.