Is trading Bitcoins/Altcoins Halal or Haram? (sunni view)

I would like to know if trading with Bitcoin and altcoin to make profit is halal? I've searched for the subject but I only found different opinions for currency trading. I think that crypto-currency is little bit different, it's not stored in banks, I can keep it in my machine, and trading purposes I had to store my coins in a website then for every exchange there's some fees, these fees differ from one trading platform to another. The fees may be composed of: - Fees for exchange which are imposed by the currency. - Fees for the website to keep the trading platform running. This post about bitcoin in islam is quite interesting if you want to read more about the subject[1]