The real value of any Cryptocurrency is determined by the market. It is not controlled by any central bank. Cryptocurrency is controlled by an algorithm which cannot be changed by anybody. So, nobody has the control on how many such Cryptocurrency can be created in future. Most of the time, the total number is fixed. Cryptocurrency value is decided based on the relationship between supply and demand. So, it is of less importance to measure the real worth at any given moment. Its value can go up or down based on supply and demand. The value of most government-issued currencies is based on physical commodities like Gold, but cryptocurrency value is based on faith and fear. Any good news in the market can increase the value while any bad news will decrease the value. Government regulations, new legal rules, country-based restrictions, etc are the very important aspects in increasing or decreasing the current market price of cryptocurrencies.