Only two people at the insurance co. know the numbers, so the knowledge is limited. This helps because less chance of a bad actor being involved if the info is limited to a very small circle.

We would be able to spot anomalies over time in number of winners of high prizes vs. what the probabilities say, and we would investigate it if anything looked off or suspicious.

We also carefully vetted the insurance co. and the people there that we work with.

These don't eliminate this risk entirely of course, but they help mitigate it.