Was ist der Unterschied zwischen Bitcoin und Fiat-Geld?

Could you elaborate on the key differences between Bitcoin and Fiat currency? In particular, I'm curious to know about the underlying principles, mechanisms of value creation, and the potential implications for financial systems. Additionally, I'd like to understand the differences in terms of security, transparency, and the degree of control exercised by central authorities or governments. How does Bitcoin's decentralized nature compare to the centralized systems that underlie Fiat currencies? Furthermore, could you discuss the potential risks and benefits of Bitcoin, and how it might evolve in the future?