Yes, gambling sites provide us with server seeds that can be verified.
Provided they're generated on the client side.Stuff can always be manipulated if it involves server side processing.
But how do we really know that these seeds are used in actual gambling process?
You need to read this this article :
https://dicesites.com/provably-fairIsnt it possible they are just displaying server seeds and hashes that we can verify but in reality the server seeds they are using in the back-end functions of the game are actually different/rigged?
If you know little bit about web development,you can press the button to see if any network calls are made to generate those seeds.Client side function doesn't invoke any network calls.