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RE: What are CRYPROCURRENCIES? Future currencies.. and What are the miners doing?

It is compulsory to have the knowledge of cryptocurrencies. Cryptocurrency is a volatile market, with exchange rates that can wildly fluctuate by day, and sometimes by hour. Bitcoin is the better-known and most valuable cryptocurrency out there, but there are many others to explore, including litecoin, peercoin, dogecoin, monero and ripple.
When you buy or receive cryptocurrency, you are given a digital key to the address of that currency. You can use this key to access and validate or approve transactions.