I'm afraid I have to disagree with using testnet for this particular situation. The money needs to be small but real.
hahahah yeah. That is a good one @cstack. Lol. Yeah we don't want to teach kids to use "fake money" like fiat money that can just be created.
They have to feel that is real hard money. Digital liquid gold they are playing with.
Otherwise it makes no sense. So it has to be real on main net. Hmmm. Then the only thing I can think about is it should be a private node. Private nodes sending sats to each other.
And hopefully once those kids learn to send sats in their private world I created, they can use those sats to go public. And ask mom and dad: Hey mom and dad, here is how to create a wallet and I will send you some sats I earned today....
It has to be real hard money.
reply