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'' The self-regulatory organization FINRA and the North American Securities Administrators Association have issued investor alarms about bitcoin.177178
An official investigation into bitcoin traders has been reported in May 2018. The U.S. Justice Department launched an investigation into potential price manipulation, including the techniques of spoofing and scrub transactions.180181182 Dealers in the U.S., the U.K, South Korea, and possibly other countries are being investigated. Brett Redfearn, head of the U.S.
The U.S. federal investigation was motivated by concerns of possible manipulation during futures settlement dates. The final settlement price of CME bitcoin futures contract is determined by costs on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial shipping date in January 2018, the CME requested extensive detailed trading information however several of those exchanges refused to provide it and afterwards provided only limited information.
Academic research published in the Journal of Monetary Economics concluded that price manipulation occurred during the Mt Gox bitcoin theft and that the marketplace remains vulnerable to manipulation.186 The history of hacks, fraud and fraud involving bitcoin dates back to at least 2011.187
Research by John M. Griffin and Amin Shams in 2018 indicates that trading related to increases in the amount of the Tether cryptocurrency and associated trading in the Bitfinex exchange account for about half of the purchase price increase in bitcoin in overdue 2017.188189
J.L. van der Velde, CEO of both Bitfinex and Tether, denied the claims of price manipulation:"Bitfinex nor Tether is, or has ever, engaged in any sort of market or cost manipulation. Tether issuances cannot be used to prop up the price of bitcoin or any other coin/token on Bitfinex. "190
The Bank for International Settlements outlined several criticisms of bitcoin in Chapter V of the 2018 annual report. The criticisms include the lack of equilibrium in bitcoin's price, the high energy consumption, high and variable transactions costs, the poor security and fraud at cryptocurrency exchanges, vulnerability to debasement (from forking), and also the influence of miners.191192193.
Bitcoin and other cryptocurrencies see post have been identified as economic bubbles by eight Nobel Memorial Prize in Economic Sciences laureates, including Robert Shiller,195 Joseph Stiglitz,196 and Richard Thaler.19713 Noted Keyensian economist Paul Krugman wrote in his New York Times column criticizing bitcoin, calling it a bubble and a fraud;198 and professor Nouriel Roubini of New York University known as bitcoin the"mother of all bubbles. "199 Central bankers, including former Federal Reserve Chairman Alan Greenspan,200 investors such as Warren Buffett,201202 and George Soros203 have stated similar views, as have business executives like Jamie Dimon and Jack Ma.204.
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Bitcoin has been criticized for the amount of electricity consumed by mining. As of 2015update, The Economist estimated that even if all miners utilized modern amenities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours per year).133
In the end of 2017, the worldwide bitcoin mining activity was estimated to consume between one and four gigawatts of electricity.205 Politico noted that the even high-end quotes of bitcoin's total consumption levels amount to only about 6 percent of the entire energy consumed by the international banking sector, and even if bitcoin's consumption levels increased 100 fold from today's degrees, bitcoin's consumption would still only amount to approximately 2% of global electricity consumption.206.
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To reduce the costs, bitcoin miners have put up in places like Iceland where geothermal energy is economical and cooling Arctic air is liberated.207 Bitcoin miners are known to use hydroelectric power in Tibet, Quebec, Washington (state), and Austria to decrease electricity costs.206208209210 Miners are drawn to suppliers like Hydro Quebec that have important source energy surpluses.211 According to a University of Cambridge study, a lot of bitcoin mining is done in China, where electricity has been subsidized by the government.212213.
Various journalists,207214 economists,215216 and the central bank of Estonia217 have voiced concerns which bitcoin is a Ponzi scheme. In 2013, Eric Posner, a law professor at the University of Chicago, stated that"a true Ponzi scheme takes fraud; bitcoin, by contrast, seems more like a collective delusion. "218 A 2014 report by the World Bank concluded that bitcoin was not a willful Ponzi scheme.219:7 The Swiss Federal Council220:21 examined the concerns that bitcoin might be a pyramid scheme; it concluded that,"Since in the example of bitcoin the normal promises of gains are more tips here lacking, it cannot be assumed that bitcoin is a pyramid scheme" In July 2017, billionaire Howard Marks referred to bitcoin as a pyramid scheme.221.