https://en.wikipedia.org/wiki/Hardware_random_number_generat...
In general, you can pick a random seed at the start of the day, commit to it somewhere (eg publish a hash of it on the bitcoin blockchain, or just on your website), then use that seed in a cryptographically secure PRNG on your website all day, and at the end of the day you publish the seed you already committed to.
This way people can check that you didn't cheat, but can't guess their opponents cards either.
I guess I'm not sure what publicizing their PRNG is meant to prove. It shows they didn't cheat via a very specific type of cheating but there are several other potential cheating vectors.
Yes, and this is not the only anti-cheat method they had.
I've always wondered: why aren't ADCs (e.g. mic input) and temperature sensors considered a good source of entropy, particularly if the lower bits are taken?
If you want/need to be able to argue to a third party that your entropy was good, you can spend a bit more.
How do you convince anyone that your mic input was actual real mic input, and not just a sequence of bits you made up to be convenient for you?
