How does the multiplier work? Is 2x is the only available multiplier as I do not see any way to change the multiplier or odds. But what makes me confuse is about the information in the Help Center page as below screenshot:

The question is about multiplier but the answer is about the rolled number. Those are 2 different things and might be confusing for most people. It does not work as common dice game in the industry so it needs to be explained in more detail so player can understand the game first.
All numbers are generated by Google's random number generator.
Which one is correct, you say here that numbers are generated by google's random number generator but on your Help Center page it tells me a different thing as you say there that all numbers are generated by Bitcoin Blockchain Hash.

Obviously, OP is not ready to launch his casino and does not how to promote a casino here in this forum things could have been easy if he has the experience and he reads the rules here or takes time to check how this forum works.
I can't trust a developer who has not done his assignment everything depends on the preparation and the launching day you fail this and you fail your project and you will be back to the drawing board.