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Central Bank of Israel

Central Bank of Israel

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Mixed denomination Shekel currency banknotes and coins sit on display in this arranged photograph at Israel's central bank in Jerusalem, Israel, on Monday, Aug. 19, 2013. Israel's shekel headed for the weakest level in almost a month on bets the Bank of Israel will continue to buy dollars to stem a rally in the best-performing major currency this year. Photographer: Ariel Jerozolimski/Bloomberg via Getty Images

Mixed denomination Shekel currency banknotes and coins sit on display in this arranged photograph at Israel's central bank in Jerusalem, Israel, on Monday, Aug. 19, 2013. Israel's shekel headed for the weakest level in almost a month on bets the Bank of Israel will continue to buy dollars to stem a rally in the best-performing major currency this year. Photographer: Ariel Jerozolimski/Bloomberg via Getty Images

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The Cryptotrader application is seen running on an iPhone on November 8, 2017. (Photo by Jaap Arriens/NurPhoto via Getty Images)

The Cryptotrader application is seen running on an iPhone on November 8, 2017. (Photo by Jaap Arriens/NurPhoto via Getty Images)

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A man walks out of a shop displaying a bitcoin sign during the opening ceremony of the first bitcoin retail shop in Hong Kong on February 28, 2014. Bitcoin was invented in the wake of the global financial crisis by a mysterious computer guru using the pseudonym Satoshi Nakamoto and unlike other currencies, it does not have the backing of a central bank or government. AFP PHOTO / Philippe Lopez (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

A man walks out of a shop displaying a bitcoin sign during the opening ceremony of the first bitcoin retail shop in Hong Kong on February 28, 2014. Bitcoin was invented in the wake of the global financial crisis by a mysterious computer guru using the pseudonym Satoshi Nakamoto and unlike other currencies, it does not have the backing of a central bank or government. AFP PHOTO / Philippe Lopez        (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

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LONDON, ENGLAND - OCTOBER 24: A visual representation of the digital Cryptocurrency, Bitcoin on October 24, 2017 in London, England. Cryptocurrencies including Bitcoin, Ethereum, and Lightcoin have seen unprecedented growth in 2017, despite remaining extremely volatile. While digital currencies across the board have divided opinion between financial institutions, and now have a market cap of around 175 Billion USD, the crypto sector coninues to grow, as it sees wider mainstreem adoption. (Photo by Dan Kitwood/Getty Images)

LONDON, ENGLAND - OCTOBER 24:  A visual representation of the digital Cryptocurrency, Bitcoin on October 24, 2017 in London, England. Cryptocurrencies including Bitcoin, Ethereum, and Lightcoin have seen unprecedented growth in 2017, despite remaining extremely volatile. While digital currencies across the board have divided opinion between financial institutions, and now have a market cap of around 175 Billion USD, the crypto sector coninues to grow, as it sees wider mainstreem adoption.  (Photo by Dan Kitwood/Getty Images)