I see that you came with this question on January 29, so you probably tried to register on Binance after January 4. The problem is that Binance exchange temporary disabled new registrations because of increasing flow of new users and difficulties in serving all available customers. It plans to upgrade its system and to make it capable of processing large amount of transactions. After this, registration will be probably reopened. Same issues may be also encountered on other popular exchanges like Bittrex or Bitfinex.
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