Bitcoin uses a Proof-of-Work mining system. This means a network of miners computes complex calculations to keep the Bitcoin blockchain running. Miners earn newly minted Bitcoins as a reward for their work. Proof-of-Work allows Bitcoin to attach a physical value to its transactional system. A Bitcoin is worth a certain amount of computing power.
The price fluctuations came as conflicting reports on whether Chinese property giant Evergrande had "defaulted" on its loan surfaced.

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We set the stage for our formal econometric analysis by providing some graphical evidence. For example, in Figure 1, we see a close mapping of the prices of Bitcoin and Ethereum with their respective computing power values. Moreover, in Figure 2, we observe an even stronger mapping of the prices of Bitcoin and Ethereum with their respective network values. Interestingly, these graphs also show that when prices significantly exceed the trend in computing power or network (as was the case in late 2017), prices eventually fall and trace the trend in fundamentals. The convergence of prices to the trend with fundamentals suggests that fundamentals are the ultimate, long-run determinants of prices.