I was thinking about this topic and I think op should implement his provably fair system on some demo casino. That way would be easier to explain to casinos how does the New provably fair system works.
I could help on this, I have a casino software with 4 games, if you want send me a PM and we ca find the way to works together.
This is not a bad idea. OP has shown a willingness to put their money where their mouth is (although without funds being escrowed it is just words). I doubt many large casino executives care about $2500 though. That may be a big amount of money for you or I, but to someone with millions coming in, it honestly probably isn’t an incentive. Going at it along and building a player base might be the best way forward.
I think this was already suggested to the OP at some point, but, if I understood correctly, his main fear is that someone will steal his idea once he sees it in action, because it is supposedly so simple and straightforward. So its a classic catch-22 situation. he doesnt want to show or explain his idea, and he wont get any serious offers because he has nothing to show.
To get the ball rolling, he needs to demonstrate his concept, but hes afraid to do so for fear of intellectual property theft. Maybe a compromise could be reached where he shares a simplified version of the idea, without revealing the core mechanics.