If you are referring to Bitcoin, then the governments of countries that have legalized it should add it to the their school curriculum, so that student can understand how it works, its potential benefits and risks, and how to use it responsibly before they start making decisions involving cryptocurrencies. But if you are referring to cryptocurrencies, I don't think they should be added to the school curriculum as a whole because not all cryptocurrencies are worth learning about.
Government can not add cryptocurrency in the national curriculum, they have not trusted cryptocurrency till date, if government will add cryptocurrency in the national curriculum learning, it will not have it is own specification, it will be sub course and programme under accounting department, having cryptocurrency as a head of department it will be something that will happen in future by the time they have known the lifespan bitcoin and other cryptocurrency can ascertain