I’ve been breaking my brain for around 10 minutes trying to think of a way to program an app that didn’t involve a central database/server. For the list of most valuable OTP threads I’m using a Google sheet as the database. So I can imagine that each user of the app would have their own Google sheet to keep track of their WTPs/WTAs. But how to populate the app with relevant matches in the area? The app would somehow search all the sheets in the relevant area? Ouch my brain.
I’m not an expert by any means, and I’ve not studied his work in detail to point you at anything in particular, but this has more than a distant echo of Al Roth and his exchanges for kidneys. No money is involved there (also for legal reasons), but there is no reason why it could not. And I am not sure it needs to involve a central server.