>> As of July 2015, there are at least 522 known cryptocurrencies,<p>Realistically: sort by popularity in descending order and keep the top 3.<p>>>tens of reliable cryptocurrency exchanges<p>...until exchange will either get hacked or owner will ran away with customer's money...<p>>> and a growing suite of services specifically facilitating financial operations in cryptocurrencies<p>These are great business models.
Just like selling shovels to gold diggers - never fails during the gold rush.