Meanwhile, even the most enthusiastic bitcoin evangelists are realizing that a retooling is in order. Michael J. Casey, a senior adviser for blockchain research at MIT’s Digital Currency Initiative, recently wrote about how the crypto-winter has arrived, but it may lead to better things down the line:
"For any centralized service, we have to do [client verification] and hold customer data," Zhao said. "On top of that we have to hold customer assets. Unlike banks, when the assets get stolen it's difficult to get them back. There's a high responsibility on the centralized exchanges we need to carry out well."

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Overall, it appears from these results that cryptocurrencies may experience short term intervals of co-movement, caused by sector wide news or cross market contagion, though correlation is likely to change dependent on the nature of the causal event and market environment. In the medium and longer term Bitcoin and Litecoin are strongly related; it is believed this is due to their similarity.