In Argentina, the sharpening guy plays a cute flute sound to announce he's in the area and uses his modified bicycle he rides to use as the sharpening engine. So cool.

Ah-agh! Why not just let that knife-sharpening bloke make full use of both? Nobody in the Bitcoin Space should be even hinting for the non-use of Fiat cash ... which (until further notice) remains the ultimate means of privately exchanging value.