How much is true USD?

Could you elaborate on the concept of "true USD" in the context of cryptocurrency and finance? Is this referring to the actual value of the US dollar in the traditional financial system, or is there a specific metric or perspective you're referencing within the cryptocurrency sphere? Given the volatility and decentralized nature of cryptocurrencies, how does one accurately assess the "true" value of the US dollar when compared to digital assets? Are there any specific indices, metrics, or methodologies that are commonly used to determine this? Clarifying this terminology would help me provide a more informed answer.