For provable fairness onchain, i have been stumbling upon solutions like this one from Chainlink:
https://docs.chain.link/vrfVerifiable Random Function is used by quite a few smaller onchain platforms in the meanwhile, think this is something to take a look at, especially taking into account the reputation Chainlink has build for themselves.
The biggest oracle competitor, Pyth, has been developing a similar solution, Entropy, but i have not heard of projects using it yet
https://pyth.network/blog/pyth-entropy-random-number-generation-for-blockchain-appsThis is very interesting, but not from the player’s point of view. The player, again, should trust the system or understand a very complex process.
On the other hand, the link you provided redirects to a page for version documentation, which itself contains “developer documentation” link, that redirects to the first page, that has no developer documentation whatsoever, but only on the commercial use of their services.