In the past 2017, the surge of cryptocurrency has inspired  the enthusiasm of many countries.   Meanwhile，there was also a lot of worthless air-coin happened in many developing country. Most of these cryptocurrency are swindlers. And their characteristics are similar as below:
1. Registration:  If you want to registe, you must have a invitation code.  This invitation code bases on pyramid selling system. It  encourages the early entrant seek more and more uninformed people. The more people, the greater the possibility of deception.
2. Controlled price: the price of coin is controlled by charlatan. It shows the people a more optimistic future and not a risky investment. The coin price has been rising since its birthday even during collapse preiod.
3. Community: The  charlatan established many social networking platforms to gather many uninformed people. People are motivated by  the rising price and begin to seek more  efficient method.
4. Mills:  The charlatan has developed some kind mills. In fact, their mills are time-counter of possession. But if you want this counter, you must purchase the lager mills. When you express purchase will, there will be some enthusiastic people to promopt mills to you at once.
5. Cut off:  when you get more coin, you want to sell them.  At this moment, you will find that everyone on trading list will refuses you invariably. And after several attempts, you will be cut off to load the website someday. And now,the game is over.
6. The same owner:  tracking IP of these websit can help you  distinguish these fraud air-coin in a way because of the same owner.
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