Today is the trend of crypto-currencies, day to day new currencies are being created by developers, huge giants are also dipping toes into this space, this trend was started in two thousand eight when Bitcoin was created by unknown person, when popularity of bitcoin was increased it touched more then 1000 dollar price in 2013, but unfortunately Japan's largest currency exchange MT Gox was hacked and value of one Bitcoin was decreased upto 150 dollar in just 4 monts.
Now Steemit, Steem Dollar SBD Stellar, Ripple, Dogecoin, Synereo, Start, NXT, Syscoin, Blackcoin, Darkcoin and much more coins have been created, and day to day quantity of digital coins or crypto-currencies is being increased, according to coinmarketcap.com number of crypto-currencies is crossed 690, and in coming days more and more crypto-currencies will be in the market, each every company is coming with new idea and they are toching highs.
Thes crypto-currencies are being traded in exchanges like poloniex.com, kraken.com, btc-e.com, http://www.btc38.com/trade_en.html and other exchanges, like bittrex.com, bitfinix.com and much more, I think this is profitible busines,,
There are so many and each with their own claim to fame, but I will stick with Bitcoin for one main reason, when things fall apart it is where most will go and their market of retailers now is far above any others.
Yea bitcoin is main currency, not only you but mostly traders support BTC