I'm not really sure if this is what you are getting at but it is using physical properties associated with QM to create the random numbers. Not just a mathematical model.
"This is the first random number generator service to use quantum nonlocality as a source of its numbers, and the most transparent source of random numbers to date."
"This is the first random number generator service to use quantum nonlocality as a source of its numbers, and the most transparent source of random numbers to date."