Actually, I am still not really sure about how the government can make a regulation or laws of crypto tax. It is not easy to know how much someone own crypto assets. But yes, it is not impossible to do it but needs the honesty of the owners. In my country, it is no crypto tax laws as crypto is still not really familiar to my society. However, if it is getting familiar and the government knows many people are rich with crypto assets, then they should think to set specific laws on it.