The same way someone would explain a child of today the internet from 1991. You start with the first principles of the system. Cryptocurrencies represent a fundamental change in how value is accounted, moved, transformed, earned and legally encumbered. The end goal is to promote a system that is censorship resistant, transparent, inclusive, accountable, corruption free and self-evolving. Furthermore, if it's successful, then like the internet that preceded it, the system should become ubiquitous. It's a standard that flows across every part of the social experience of commerce and relationships.
To a child, like children with iPads today, we know the system has succeed if they accept it as they would a book or a toy. It is and one cannot imagine a time when it wasn't even if they lived it.
Full transparency is a huge mistake. If all of our economic lives are transparent, we lose a great deal of privacy, and with it, dignity and choices in life.
As it stands now the state already has too much control over our financial lives. If anything, crypto can help by once again reversing this back to where it belongs -- none of your damn business.
thanks @charleshosk ! 8]