There are reasons why perhaps it's not fair to say this would happen with Bitcoin -- it's a lot easier to take custody of spot after all, and very little reason anyone might want to accept a BTC note in place of BTC. The idea that it'd ever trade at par seems pretty unlikely.
But I guess therein lies my disbelief that there'd be much reason to accept a bill of sale in exchange for spot Bitcoin. If interest rates were below 20% for any real size I'd be pretty surprised.
