It's traded on the stock exchange and it's market price is denominated in the countries debt divided by its total population.
Discussion
Market manipulation opportunities abound. Bundle certificates into tranches. Then use the tranches to create futures swaps on Bitmex. From there, two choices:
(1) Go short 100x, then watch Congress borrow forever.
(2) Go long 100x, then have a Genghis Khan level crapton of babies.
Either way, profit.
Arthur in disbelief