Correct, and we can offer the possibility to look being the scene, control the math, verify the legitimity

In the future we expect to offer a minimalist decentralized version, while running our partially centralized server

Thank you for this constructive comment, which raises several interesting points.

- ETFbitcoin it gives a good start to an answer, indeed the price of bitcoin is not due to chance but responds to mathematical chaos, it is therefore by definition unpredictable, apart from insider delirium... If someone wants to manipulate this market they must use astronomical sums to have a real impact, so to cheat the lottery it may not be lucrative

- Earning several people every day was an option that we ruled out, simply because our NFTs on Bitcoin are exchanged at a lower cost via our marketplace. So we want to maximize the "prediction exchange" aspect which makes the game much more user-friendly and exciting. Moreover a lottery is much more thrilling if the jackpot is worth it.

In short, we introduce the possibility of developing real strategies and we can't wait to see groups forming to try to win thanks to their brains.

- The NFT part is based on the Ordinals recently appeared on Bitcoin, it is for us the opportunity to offer a first concrete use case of these, the use is simple and the costs are very correct thanks to a prediction compression. Also the principle of "Quantition" that I recently developed contributes to a fluidity of the marketplace while reducing costs to a minimum. I will talk about it just below

Well, actually there's a similar product already. Please, check https://structure.finance/dnt/
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The world of trading allows you to trade options, the broker only earns fees, it is the sellers and buyers who "fight in the arena". However on this site, it seems that the players bets against the "casino", the opacity of the calculation allowing to place the high and low limits prevents us from knowing the margin which the site takes.

At Purple-eyes, we take a clearly displayed fixed service fee. We have no advantage in this or that player winning the jackpot, so we are much more in the spirit of a site at the service of players, than a site against which the player must win.

Thank you for thinking with us

A disclaimer on the website say : "This webapp is a proof of concept. We are working on fully decentralizing it."

Then sure it is partially centralized, we know that we face a long way to create a fully decentralized version, and with our current knowledge, technically we can't do that for a big lottery that involve thousands of tickets.
We need a lot of optimization and training before thinking about the decentralization part, but for me it's possible.

As you say, "smart contract" need oracle, and the oracle himself need to be decentralized, it's not easy to do, and not free of gas. But if we have enough experience with our project, we can imagine a solution with reasonable gas cost for a fully decentralized version.

I am not Satoshi, just a passionated programmer, with low english skills, that want to expand the Web3 usage.