Bitcoin is digital money used for secure and instant transfer of value  anywhere in the world. It is not controlled or issued by any bank or  government - instead it is an open network which is managed by its  users. Much in the way email improved communication by making it fast  and cheap, bitcoin is an improvement on existing payment methods which  were not designed for the internet era.
Is Bitcoin safe?
Bitcoin’s core protocol is viewable by anyone, has been vetted by  thousands of security researchers around the world, and has proven to be  robust and reliable after immense scrutiny. Using bitcoin is similar to  using other private applications on the internet, such as email or  online banking. Just like these other web services, you must access your  bitcoin with a password in order to ensure only you have access to your  money.
 
  Is it tied to the value of the dollar?
The value of a bitcoin is not tied or pegged to the value of any other currency. Similar to stocks or property, bitcoin’s value is determined by buying and selling in the open market. A bitcoin’s price changes in real time based on the number of people who want to buy or sell it at a given moment.
Why does it change value?
Bitcoin is traded for dollars, euros, yen, and other currencies in  real time 24 hours a day. Depending on the demand for buying or selling  bitcoin, the price can fluctuate from day to day. This is similar to the  manner in which the value of a stock or property can go up or down  based on supply and demand. Bitcoin’s value can be volatile compared to  traditional currencies such as the US dollar because it is still an  emerging technology.
 
  
 
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