Quote from: RHavar on February 12, 2017, 07:29:25 PM

Quote from: Baryom on February 12, 2017, 01:39:36 PM

Is there someone who has an idea of how to provide (create) a provably fair system for relations between the investors and casino ?

Yeah, i can think of a few ways.

The simplest is the one I developed before, you can check out pevpot's thread which is now defunct, but it had a provably fair scheme that was totally fair for both investors and players, and used the blockchain in a way that was robust against miners too. But since the method requires waiting on blocks, the UX is going to suck pretty hugely. But it might be worth it for huge bets (e.g. >100 btc). Maybe?

The other way to make it provably fair for investors, the workflow could be something like this:

1) User sends bet to the server
2) Server publishes that bet to investors
3) Investor with at least $BETPROFIT BTC in theier account accepts the bet, and sends a hash of a random number and seed they generated
4) Server locks user/investor balance for the amount and sends the server hash to the user
5) User records the hash, and then sends a client seed to the server
6) Server sends client seed to investor
7) Investor uses the client seed to know if they they won or lost, records it, and reveals their original random number and seed
Cool

Server validates the investor random number and seed, and resolves the bet in favor of the investor or client

That should be provably fair for both investors and users.

With a bit of scripting magic, I'm reasonably sure it's possible to make the above procedure not just provably fair, but actually completely trustless. I'll avoid saying too much, incase I stumble upon a bottle of amphetamines and get the energy to try commercialize it =)

The problem with this is that, as you said, the player would have to wait for a block between each bet. That really kills the experience; so much so that I don't think people would play on it. Definitely not enough for bitSler anyway, as their "auto-betting" thing (martingale script) boasts 300 bets per second.

However, block time on Ethereum is only 12 seconds which is far more reasonable. I think your solution is much better applied there.

Also, I'd still like to see an off-blockchain solution if one exists. That would be awesome.

I don't think it's possible though.