Today we knew that the American Office of the Control of Foreign Assets, began to create a base of unreliable crypto-currency wallets. This happened, incidentally immediately after the signing of President Trump's decree, to ban the Venezuelan crypto currency "el Petro", where other currencies were listed, BTC, ETH, LTC, NEO, XMR and XRP, whose wallets should be included in the sanctions lists. It is interesting, Trump's order prescribes the blocking of cryptowallets of persons under sanctions, as well as suspicious persons, or those wallets, where was noted the interaction with wallets being prohibited. But, how to do it technically is not explained, but in the case of one of XRP (Ripple) - it could be done really easily.
 In addition, the US Office for the Control of Foreign Assets, will encourage citizens who will send numbers of suspicious purses, to include them in the database.
Prove is here



Honestly, I don't think that there is a possibility to block wallets, of real cryptocurrencies, but as far as they knew how to track the BTC transactions (with all your personal data), and we cannot avoid such kind of control, maybe in future they will gain the ability to lock the BTC/ETH wallets. Nevertheless it is one point plus to Dash and ZCash.
 Any thoughts?