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"Virtual currency" is an electronic money that can use on the Internet.
It has begun to circulate all over the world since it developed in recent years.

"Virtual currency" seems to be convenient at a glance.
However it has some risks.
This time, let's study "Bitcoin" that is one of the virtual currencies.

For the beginning, what is “Bitcoin”?
Who issue Bitcoin?
Where is the position of Bitcoin in the world?
About management of Bitcoin.
How do Bitcoin increase?
Let's study Bitcoin's merit.
Let's study Bitcoin's demerit.
The affairs about Bitcoin.
Bitcoin and politics, economies.
Summary of this theme.