Hello newly registered fake account,
I am willing to proof it with a monetary bet of 50 BTC or the equal amount in XMR;
Whichever escrow is used is up to you as long as he´s neutral and has a good reputation.
How do you do that? You can, for example, give risto 25 BTC and tell him to say he did it.
How can you prove it?
1. I said a
NEUTRAL Escrow.
2. We would go to a notary/lawyer to testify the trade history, costs a few hundred bucks.
Better make a fake Wall.

There is no such thing as a "fake" wall. Once an order has been placed on the market it is there and ready to be executed. People put up and remove walls all the time, but most walls are too small to notice. People like to pay attention to big walls and sometimes alter their trades based on it. It sounds like you are grumpy and my guess is that you got burned. Welcome to the free market. I hope after a few more years you'll learn to appreciate the liquidity that such walls provide for large holders. I personally would be delighted to see more big walls appear, it will give me more confidence in the market. For I could quickly get rid of my position by dumping into such "fake" walls, the more of them appears, the more opportunities I have to do so.
Instead of getting mad for what you deem to be "manipulation" and "fake walls" I encourage to take advantage of your knowledge and turn it into profit.
That is so true. It's really a shame that more people don't understant the opportunities that walls create. Not only do they provide liquidity, they provide you with an opportunity to buy or sell without moving the market. If you want to acquire a large position without driving the price up and costing yourself a fortune, wait for a big sell wall. Not only will you get the opportunity to screw somebody trying to drive the price down, you'll also get a sizable position for a reasonable price.
Buy walls give people with large positions the opportunity to exit their position without screwing everybody over by driving the price down. So don't think of large walls as something bad. Think of them as an opportunity.