I thought your have a good intention to your child for teaching him about criptocurrency. You thought that when your child knows about criptocurrency earlier your child will have a better future. However this kind of things will block his good relationship to other childrens like him. He didn't enjoyed his childhood because he probably getting serious about what you teach him. For me at the age of 10 childrens must do to enjoy they childhood activities to improve their self confidence, self esteem, and als to develop their good attitudes and good moral character. Let them experience what other children experience too, give them to a good guidance to build up their a good relationship to the community. Let them discover about what you want to thought them before.
Bitcoin is not actually an investing instead giving them a proper education is the key to become great person and to have a better futere to them.