what about the parents? have they been informed about you teaching the kids about blockchain aside from the subject that you actually teach? I admire that you try and teach and introduce them to blockchain and cryptocurrency but knowing how parents can be sensitive(sometimes too sensitive) to what teachers teach in school, I'd be surprised if all the parents of the kids that you teach are ok with it.
Let's not overthink this. Blockchain is simply a new technology. I understand that some parents may be sensitive to political, philosophical, or religious issues, but why would they oppose teaching their children about new technologies?