That is a good idea. Teach children about the business world. But keep in mind that the things that children need to know is limited. So do not be too deep to tell him about cryptocurrency.
It is a good idea if they are interested to learn about it, means we are not forcing them to learn something that they do not want to learn. Let them choose what they like, children has their own interest in this world. So just teach them about the think they want to know, you may try to introduce it only and see whether are interested to it or not.