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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 possible 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. federal 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 first delivery 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.
Academic research published in the Journal of Monetary Economics concluded that cost manipulation occurred 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 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 roughly half of the 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 amount of bitcoin or any other coin/token on Bitfinex. "190
The Bank for International Settlements summarized several criticisms of bitcoin in Chapter V of the 2018 annual report. The criticisms include the lack of stability in bitcoin's cost, 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 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 the"mother of all bubbles. "199 Central bankers, including directory former Federal Reserve Chairman Alan Greenspan,200 investors such as Warren Buffett,201202 and George Soros203 have stated similar opinions, as have business executives such as 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 though all miners utilized modern facilities, the combined power consumption would be 166.7 megawatts (1.46 terawatt-hours annually ).133
In 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 quotes of bitcoin's total consumption levels amount to only approximately 6% of the total energy consumed by the global banking industry, and even when bitcoin's consumption levels increased 100 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 lower the expenses, bitcoin miners have put up in areas like Iceland where geothermal energy is cheap and cooling Arctic atmosphere is free.207 Bitcoin miners are known to utilize hydroelectric power in Tibet, Quebec, Washington (state), and Austria to reduce electricity prices.206208209210 Miners are attracted to suppliers like Hydro Quebec who have energy surpluses.211 According to a University of Cambridge study, a lot 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 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 deliberate 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 gains are 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.