For me bitcoin are both an opportunity and challenge. Opportunity because through bitcoin we can invest,we can do trading,in over all we can earn. It is also an opportunity for us to have a bright future and sustainable living. Bitcoin also is a challenge because you need to have enough patience before you earn it. You need to works hard if you don't have cash to buy bitcoin. You need to learn and have knowledge about it that if the time of bitcoin trials come you still stand strong and stay believe and trust to bitcoin no matter what happen. A lot of challenges in bitcoin but the more challenge the more we excite to have it more. So,don't hesitate to invest in bitcoin and face those challenge but don't borrow or lend money just to buy bitcoin because it is so risky just invest the amount that you can afford to lose.