I am very sure that
https://betking.io holds on to more Bitcoin of player and investor funds than any other Bitcoin casino/dice site as we hold close to 5000 Bitcoin.
What % of that 5000 BTC is yours and how does an independent 3rd party verify that?
I used to have the investment funds public but removed that as users were having accounts at Coinbase frozen for sending funds from gambling site.
The funds are now not public but I just had Dooglus audit that I still had the funds by sending him a signed message using the Bitcoin address.
You can see here
https://bitcointalk.org/index.php?topic=910134.msg15497634#msg15497634The bankroll has increased since then again.