One of the biggest challenges that we will encounter in Bitcoin is the Scalability problem which means there is only limited amount of information that can be contained or its capacity. I'm sure that there will be more people who will going to join the campaign which will result to a possible delay during processing or trading. So how can we provide a solution on this or how to ensure that all the trading done were saved once delayed before bitcoin achieves mainstream adoption?
For me the challenges the i encounter is lack of knowledge in trading bitcoin so that i dont know how to trade my token because im scared to lost it. Next is waiting so long to give my token in some signature campaign. And last is losing my token in my ether wallet.