of course not bitcoin is a digital currency that only belongs to itself no ponzi element, if you say ponzi seems you are affected by some mining and some investment projects or doubling the bitcoin that most today use ponzi scheme.
Bitcoin is very different from the ponzi scheme. Let's look at the difference:
The Ponzi scheme is an investment fraudulent activity that pays profit to investors from their own money, or money already paid by the previous investor, and not from the profits earned by each individual running the business. While Bitcoin is a software project without central authority. Consequently, no one can cheat with regard to investment profits. Like most major currencies (gold, US $, euro, yen, etc.). There is no warranty on the ability to buy and free exchange rates. This leads to volatility in which bitcoin owners can immeasurably gain or lose money. Bitcoin is also a useful and competitive payment system that is being used by thousands of users and businesses. So what do you think?