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China gold reserves are among the biggest in the world - but the country has been secretive about how much gold it actually has. China hasn't reported its official gold holdings for six years and counting.
Watch the video to see how analysts know China is secretively stockpiling gold - and exactly what that means for the future of the U.S. dollar:
This video is our third installment in a series profiling five looming threats to the U.S. dollar. Watch them all here: