^Snipped
The school has no issue with me teaching anything blockchain-related. I had already taken that up with my bosses before attempting. Remember this is only for a total of 2-3 days over the entire school year.
My students certainly do not have any dev experience outside of using coding dot com. As far as "just teaching them the theories and concepts of bitcoin", theories and concepts do not make for a very exciting project. Especially the day before Christmas break.
It's interesting to hear that the school approves of your extra curriculum subjects. Since your students don't have the basic building block knowledge/foundation for their developer career and then just skipping the ABC to teach them how to make smart contract might be a little too much. This is just my opinion but if it works great and they enjoy it, I'm good.