Bump, I do not know if this board is appropriate, I moved it from off-topic for inactivity.
Well, if you make it "educational" then you can move it to the newbie section where you will get a lot of activity.
Let them do the research and then use some of your donations to fund a little prize for the first person that complete it.
The more experienced members can also have a crack at it, because it is just for fun.
Some people might enjoy it so much that they might even pay a entry fee to participate. It is nice of you to explore the possibility to include the Lightning Network, because it is ideal for micro payments that is needed for this.
<All entries goes into one pot, you take 15% and give the balance as a prize.>