There is a new European exchange: Litebit.eu. The tutorial is informative for new users. See other posts about trading
There are many different ways to secure a blockchain. Some cryptocurrencies have a proof of work consensus, where extensive calculations are needed (mining), to secure the blockchain. With proof of stake, the amount of coins, residing on an online wallet have value to be selected more frequently to confirm transactions.
Pinkcoin is a proof of stake cryptocurrency. This means, that the wallet software secures the network. This is done by leaving funds in the wallet, and keep it on line. See more in the video.