As I write this I can imagine a cryptocurrency marketplace for insider information. The insider asserts some fact about a company and stakes an amount in crypto. Buyers see the potential - e.g. "Amazon insider staking 1 million for X% return" and can choose to take on the deal or not. If the buyer does take on the deal they see the information and if the information is borne out then the buyer must return the insider's investment plus X%. Otherwise the buyer gets the insider's stake.
There's a lot of rough edges and potential for abuse, but I can imagine something like this making it hard or impossible to prove insider trading.
We don't have to imagine it too hard, something very similar already happened! https://www.bloomberg.com/opinion/articles/2021-03-22/fake-i...