NSA sorcerer, Edward Snowden believes that Bitcoin will not be in high positions for ever, when Bitcoin will be replaced by a digital coin which does not use the public registry.
In an interview, Snowden Blocstack took part in Berlin Exxax, he mentioned that the main problem of Bitcoin was not scaling, but the privacy less degree Snowden mentions that many people are talking about restrictions on transactions currently, believe that this is the main error of Bitcoin. However, Snowden believes that crypto-currency is a more serious, long-term structural problem in registering its public. 
Snowden has mentioned that he has used Bitcoin in 2013 to conceal his identity specifically for the preparation of NASA content, which indicates that representatives of the NSA have actively seen Bitcoin Holders Technical experts believe that Bitcoin technology is short-lived - the creator of crypto currency is a very important Worked, but if Takayena technology is not advanced, but it will not be able to compete with the more worthy opponents.
In addition, Snowden said that most of the time he is attracted to digital currency Zcash security features. Despite the uniqueness of Zcash, according to Snowden, former ANB employee, trying to overcome the competition on the stable growth of new attractive projects, and it is a very good sign like Snowden.