My opinion doesn't matter whether I am in favor to register my wallet address or not for taxation purposes. That is because it won't happen and lawmakers will always have hard time to trace the address owners. And one thing, how can a local government trace the owner if the address is from different country like the US? I reside here in PH so I'm not sure if the government here will take time to trace every address to trace all Filipinos who have btc wallet. And remember that we can always make multiple wallets and change addresses. And the uses of mixers will always be handy. But IF they succeed to put tax in it it's fine with me as long as it will be fair and reasonable and with utmost consideration.