It was several years ago that I first heard the suggestion that the debt could be monetized by minting platinum coins with huge face value, a trillion dollars, for example. The idea has reappeared recently as a possible response to the debt ceiling.
I wonder if those making the suggestion are basing their wishful thinking on a certain story by Mark Twain.
This story is public domain and available online.
http://www.eastoftheweb.com/short-stories/UBooks/MilPou.shtml