I received a signature for a message that said:
  'this is a betking cold storage address'

The address which was used to create the signature contains a little over 4500 BTC.

Dean tells me there's ~100 BTC in the hot wallet too.

So that's a proof of assets. For real proof of solvency we would also need to see a proof of liabilities (ie. investment amounts) to make sure that liabilities don't exceed assets. The danger is that there are 10 investors each having invested around 1000 BTC, so the total liabilities are over 10k. I'm not suggesting that this is the case, merely that it is possible if each investor doesn't have a way of making sure his coins are counted in the claimed total.

Yes, but if someone hits the jackpot, what determines how much each player gets from the pot?

I don't know of a good way to do it, no.

The problem is that since the site can immediately know whether the jackpot has been hit or not, why wouldn't it be able to also know immediately before it happens, and therefore make sure to win at least part of it?

The jackpot is effectively a multi-player lottery game, and the only real solution I've seen to such a game is pevpot.com's. That was a weekly lottery where the seed was the hash of a particular future Bitcoin block, and the derivation function (turning the seed into a winning ticket number) took about 20 minutes to run. The 20 minute delay was intended to make it unprofitable for any miner to attempt to rig the result by withholding a mined block which made them lose (since by the time they figure out their block makes them lose it has already been orphaned).

That method is no use for a dice sice where you get more than one bet per second. You'd have to run the CPU-intensive derivation function for every roll, creating huge load on the server.

...
You are missing a chat room solely for people who are playing "social dice" as the chat feature is what will make it truly social verses a bunch of numbers being displayed on each betting outcome.

Note that even using bustabit's method the site would still know when the jackpot was due to hit and so could arrange to win it.

Previous posters were asking how the jackpot is divided when it hits. I don't think they got a good answer.

Suppose two people are playing when the jackpot hits. One betting 0.01 BTC and the other betting 0.99 BTC. Do they get half the jackpot each? Is it split proportionally to the size of their bets? Or something else?

What if only one player is playing and their bet is tiny? Do they still get the whole jackpot amount?

I am no expert in provably fairness, but I am not sure this is really provably fair.

Wouldn't it be possible for the a casino operator to generate new user accounts that could make the client seed to be something that is favorable to the casino operator? For example if one whale was the first to bet, then the casino operator could have the second, third and fourth user ID's be something that would result in the whale to lose his bet. The same is true if three people place certain bets, and the fourth is placed by the casino operator.

I think some of the "social" type games have every round predetermined based on a single server/client seed, so the outcome is known to the operator well in advance, and can be verified that the roll outcome did not change from the time prior to a player placing his bet to after him placing his bet.

BTW cool idea about social dice, it's definitely cool to have everyone seeing the same thing and add some context to the game. I guess the real tricky part will be having a critical mass of people playing at any time

The social dice method isn't close to provably fair, because it would mean that ever player needs to trust every player to not collude with the house. For instance if the house wanted to cheat, it could have a bot who enters the game when a whale would win (and his uid would change the client seed, and thus the outcome). The very possibility of the house to trivially cheat by definition makes it not provably fair  

Bustabit uses a pretty robust provably fair system for multiplayer games, feel free to use it if you want =)

is the new game provably fair?

Just to confirm the bankroll investment does that still just cover the dice games? If so is it all the dice games?

Also the site total investment at about    4649 ฿ is that current bankroll size? or where is the total current bankroll information?

What is your share of the jackpot based on?

The website is not working for me , Are you updating something ? I have tried refreshing the page thirce times but the site is not loading any update please ?