This is an instance of "it's technology which allows you to break the law". It's true... but I think everyone is aware of that ?
A prediction market could solve that, cheaply build consensus where it would be harder to do otherwise.
Prediction markets exist in many places with centralized exchanges/clearing houses. If there is enough volume, the market works, if there is not, it doesn't. They exist for most financial securities, commodities, sports, various weather events and probably many other things I'm unaware of.
They mostly use a central party and (i'll guess) a pretty standard sql database. Before the financial crises some of the trades were done bank to bank with (horror...) no intermediary.... like people just called each other and kept distributed records and settled up...
Which might be a fine value proposition in a good number of jurisdictions I guess, but it's a well known one already.