Everyone else who has it (all two or three of them, lol), won't release it, and I don't know that because I trust them, I know that because for each of the testers, I have leverage, and while I may not trust the farmer himself, I trust that because of his wealth and farm size that he is a rational actor. The deal we have, I created with a single major goal in mind: As long as the miner is financially beneficial to me, it is equally so to him. I made it mathematically impossible for me to benefit from it while he doesn't, or worse, loses out. Because of this, I only need to trust he is a rational actor to come to the conclusion he will continue to pay me as well as keep the miner to himself. Obviously, ceasing payment would backfire hard as I would release the miner, causing his extra profit to disappear, and publishing the miner himself would be completely irrational.
I'm not a greedy moron that goes around selling it to any stranger with money - and it's probable that any others are at least as careful, if not more, than I. So, leaks are out of the question, the likelihood of them being small enough to round down to zero.
Well, my days of not taking you seriously are certainly coming to a middle.