Fiat currency. A fiat currency — such as dollars, euros, pounds, or yen—is a trusted medium of exchange, or legal tender, that is issued by a recognized government or authority. U.S. dollars, for example, are backed by the “full faith and credit” of the United States government.
China is one market to impose strict regulation that impacted prices. In February 2018, the country blocked its citizens from accessing websites that offer cryptocurrency trading services, prompting a 15% fall in Bitcoin and 20% plunge for Ether. Similarly, in January 2018, Bitcoin’s price was hit by new South Korean legislation requiring traders to reveal their identity.

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At each point information from neighbouring data is used. As the time series considered are finite, the areas at the start and end of the data (especially at higher period bands) will not have all the data required. One solution to make computation possible, chosen here, is to pad the time series with zeros where required. However, the zero padding will impact the reliability of the results. It is standard to use a cone of influence to represent this difference in reliability of results. Pale colours represent those areas outside the cone of influence with less reliable results (as seen on Fig 3). Higher period bands require more data for computation resulting in the cone shape.