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'' The self-regulatory organization FINRA and the North American Securities Administrators Association have 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. federal investigation was motivated by concerns of potential manipulation during futures settlement dates. The final settlement price of CME bitcoin futures contract is determined by prices on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial shipping date in January 2018, the CME asked extensive detailed trading information however several of the exchanges refused to provide it and later provided only limited information.
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 background of hacks, fraud and theft involving bitcoin dates back to 2011.187
Research by John M. Griffin and Amin Shams in 2018 suggests that trading associated with increases in the amount of the Tether cryptocurrency and associated trading in the Bitfinex exchange account for roughly 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 summarized several criticisms of bitcoin in Chapter V of their 2018 annual report. The criticisms include the lack of stability in bitcoin's price, the high energy consumption, high and variable transactions costs, the bad security and fraud in 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 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 go to my site 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 facilities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours annually ).133
In the end of 2017, the global bitcoin mining activity was estimated to consume between one and four gigawatts of electricity.205 Politico noted that the even high-end estimates of bitcoin's overall consumption levels amount to only approximately 6% of the total energy consumed by the international banking industry, and even when bitcoin's consumption levels increased 100 fold from today's levels, bitcoin's consumption would still only amount to about 2% of global power consumption.206.
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To reduce the expenses, bitcoin miners have set up in areas like Iceland where geothermal energy is cheap 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 costs.206208209210 Miners are attracted to providers such as 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 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 from the World Bank concluded that bitcoin was not a willful Ponzi scheme.219:7 The Swiss Federal Council220:21 examined the concerns which bitcoin may be a pyramid scheme; it concluded that,"Since in the example of bitcoin the normal 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.