Paul Fernhout writes: China has unseated North America as the global investment leader in financial technology, or "fintech," according to Citigroup's latest report on "digital disruption." The researchers attribute the power shift to the rise of what they term "Chinese dragons," an industry term for the biggest upstarts in Asia. Think of Ant Financial, the payments spinout of Alibaba, as well as Lu.com, JD Finance, and Qufenqi, emerging eastern juggernauts that are generally less familiar to consumers in the west. China accounted for more than half of all fintech investments globally in the first nine months of last year, the report said. Specifically in terms of venture capital, the country more than doubled its worldwide share of the investment category, rising to 46% of the global total versus just 19% the same period in 2015. The U.S., meanwhile, sunk to 41% of the global total from 56% during the same period in 2015, putting it behind China.