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RE: BitSparks Going Global With Bitshares????
I think the difficult part will be getting a reliable oracle for every currency in the world. That is a tons of data sources that could be hacked. Large attack surface.
Even without hacked data sources there could be some ambiguity as different data sources fall under political sway to report meaningless 'official' rates: https://www.cnbc.com/2017/03/28/venezuelan-just-announced-a-new-currency-rate--and-nobody-cares.html