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If not, then the only method I can think of is that crypto enthusiast will have to report it to their local tax authorities. Now, it's just the question of morality, are you going to report your personal crypto profits or not? Are you willing to take the risk and hide before the authorities have to find it out?
The answer is no. Traders or investors with multiple cryptocurrencies will not report their crypto wealth just like that, because they know the taxes they will pay are quite large.
Reporting crypto wealth to local authorities will reveal everything that is held on the crypto platform.
Hiding may not be an option, but if there isn't a really appropriate method, it's still free to report it or not.
some large transactions involving crypto may be detected, but other transactions will be difficult to detect, so need another really efficient method to regulate and detect crypto transactions that will be taxed.