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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 was 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 maybe 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 costs on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial delivery date in January 2018, the CME asked extensive detailed trading information however a few of those exchanges refused to provide it and later provided only limited information.
Academic study published in the Journal of Monetary Economics concluded that cost manipulation occurred during the Mt Gox bitcoin theft and that the marketplace remains vulnerable to manipulation.186 The background of hacks, fraud and fraud involving bitcoin dates back to 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 associated trading in the Bitfinex exchange account for roughly half of the price increase in bitcoin in overdue 2017.188189
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J.L. van der Velde, CEO of both Bitfinex and Tether, denied the claims of price manipulation:"Bitfinex nor Tether is, or has , engaged in any sort of market or price 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 summarized several criticisms of bitcoin in Chapter V of their 2018 annual report. The criticisms include the absence of equilibrium in bitcoin's price, the high energy consumption, high view publisher site and variable transactions costs, the bad security and fraud in cryptocurrency exchanges, vulnerability to debasement (from forking), and the influence of miners.191192193.
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The Economist wrote in 2015 that these criticisms are unfair, predominantly since the unethical image may induce users to forget the capacities 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 at least 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 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 opinions, 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 used modern amenities, the combined power consumption visit would be 166.7 megawatts (1.46 terawatt-hours annually ).133
In the end of 2017, the worldwide bitcoin mining activity has been estimated to consume between one and four gigawatts of power.205 Politico noted that the even high-end quotes of bitcoin's overall consumption levels amount to only approximately 6 percent of the entire power consumed by the international banking industry, and even when bitcoin's consumption levels increased 100 fold from the current degrees, bitcoin's consumption would still only amount to approximately 2% of international power consumption.206.
To lower the costs, bitcoin miners have set up in areas like Iceland where renewable energy is cheap and cooling Arctic air is liberated.207 Bitcoin miners are known to use hydroelectric power in Tibet, Quebec, Washington (state), and Austria to reduce electricity costs.206208209210 Miners are attracted to suppliers 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 is subsidized by the government.212213.
Various 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 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 may be a pyramid scheme; it concluded that,"Since in the case of bitcoin the typical guarantees of gains 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.