Professor Prasad said buyers need to be aware when buying cryptocurrencies as there is almost no regulatory oversight.
WASHINGTON (AP) — The Justice Department has recovered most of a multimillion-dollar ransom payment made to hackers after a cyberattack that caused the operator of the nation's largest fuel pipeline to halt its operations last month, officials said Monday.

Lamont, O. A. (2001), “Economic tracking portfolios”, Journal of Econometrics 105 (1), 161–184.
Various factors can be used to monitor usage of a subreddit. Due to the promising trading strategy generated from the factors chosen in [7], these same factors will be examined here. Posts per day indicates the number of posts made on a particular subreddit, per day. (this factor does not include comments made in response to particular posts). Subscriber growth indicates the number of new subscribers that a subreddit receives, per day. New authors indicates the number of new authors posting on a particular subreddit, per day. This current work will aim to confirm the relationship the factors identified have with price in a model-free environment, rather than with the use of a trading strategy which can potentially introduce ambiguity relating to individual factor contributions.