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The self-regulatory organization FINRA and the North American Securities Administrators Association have both issued investor alerts about bitcoin.177178
An official investigation into bitcoin dealers has been reported in May 2018. The U.S. Justice Department launched an investigation into potential price manipulation, including the techniques of spoofing and wash trades.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. national investigation was motivated by concerns of potential manipulation during futures settlement dates. The final settlement price of CME bitcoin futures is determined by prices 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 supply it and later provided only limited data.
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Academic research published in the Journal of Monetary Economics concluded that price manipulation happened during the Mt Gox bitcoin theft and the marketplace remains vulnerable to manipulation.186 The history of hacks, fraud and fraud involving bitcoin dates back to at least 2011.187
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Research by John M. Griffin and Amin Shams in 2018 suggests that trading related to increases in the amount of the Tether cryptocurrency and related trading at the Bitfinex exchange account for roughly half of the price increase in bitcoin in overdue 2017.188189
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The Economist wrote in 2015 that these criticisms are unfair, predominantly because the shady image may compel users to overlook the capabilities of their blockchain technology, but also due to the fact that the volatility of bitcoin is changing in time.194
Bitcoin and other cryptocurrencies 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 called bitcoin that the"mother of all top article bubbles. "199 Central bankers, including former Federal Reserve Chairman Alan Greenspan,200 investors such as Warren Buffett,201202 and George Soros203 have said similar views, as have business executives such as Jamie Dimon and Jack Ma.204.
Bitcoin has been criticized for the amount of electricity consumed by mining. As of 2015update, The Economist estimated that even though all miners used modern amenities, the combined power consumption would be 166.7 megawatts (1.46 terawatt-hours per year).133
At the end of 2017, the global bitcoin mining activity has been estimated to consume between one and four gigawatts of power.205 Politico noted that the even high-end estimates of bitcoin's total consumption levels amount to only about 6 percent of the total power consumed by the global banking sector, and even when bitcoin's consumption levels increased 100 official source fold from the current levels, bitcoin's consumption would still only amount to approximately 2% of international power consumption.206.
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To reduce the expenses, bitcoin miners have set up in places like Iceland where renewable energy is economical and cooling Arctic air is free.207 Bitcoin miners are known to use hydroelectric power in Tibet, Quebec, Washington (state), and Austria to reduce electricity prices.206208209210 Miners are drawn to providers such as Hydro Quebec that have energy surpluses.211 According to a University of Cambridge study, much of bitcoin mining is done in China, where power has been subsidized by the government.212213.
A variety of journalists,207214 economists,215216 and the central bank of Estonia217 have voiced concerns that bitcoin is a Ponzi scheme. In 2013, Eric Posner, a law professor at the University of Chicago, said that"a real 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 may be a pyramid scheme; it concluded that,"Since in the example of bitcoin the typical guarantees of profits are lacking, it cannot be presumed that bitcoin is a pyramid scheme." In July 2017, billionaire Howard Marks referred to bitcoin as a pyramid scheme.221.