hacker breaking in, stealing the coins and going quiet without showing you how he did it?
They are welcome to do that. That would be real bad ass. At least we will know that a vulnerability exists. If they can do that they deserve the loot!
zero motivation that someone will even attempt to hack your site
Fine, don't be.. move on. I have already received PMs. So your point is disproved.
@examplens' idea is actually good
LOL sure buddy, gang up on me. Ally or an alias of the previous poster?
Leave very little funds in the addresses and then send most of it to an escrow.
Apply your own argument, why should I trust that escrow when you are yourself not ready to have faith at the first place. We are an exchange, we do not need escrows.
People should also be able to track and know if someone has already cracked everything
I agree with you here, but, there can be more than one way to break in. Also, we have mentioned in the OP "End of the test will be announced here in this thread." So everyone will be updated. As soon as the funds are stolen, it will be announced here. If nothing happens, after a few days, the test will still be concluded - probably will invite a separate batch of crackers/hackers elsewhere.
I appreciate you taking time to respond. If you do not agree to the terms, it is fine. I respect your PoV. I will focus on those who have sent me messages and are already onto it. Thank you.