You could track in excel. Or even the online version of excel.

Multiple ways to do it. I’ll list the simplest.

Create a columns and for each zap value you put the users name in. 10 sats = name (10 times). Each in a separate row in the column.

Then in an adjacent column have a number scale 1,2,3,… going all the way down.

Now for the winner. Write a formula to pick a random # from your # column.

=randomnumber(1,x)

Where x = the last number you have in your list.

Then do a look up for the winner manual. Or you can write another formula.

I am fluent in excel if you need help