I just asked for the NF at the shops for the reason that I explained, and certainly did not imagine that it would cause that reaction.  In fact it took us a while to realize that we were the "tax inspectors". 

It must have been the whole street, people obviously did not know who or where those "tax inspectors" were, and did not wait to find out.

Not quite "proud" but you must agree that it was a quite memorable experience.

There is one idea in crypto-currency that is unquestionably good, but most parts of the bitcoin protocol are "good" only if one subscribes to the libertarian dogma that banks and governments are evils to be removed.

I have nothing against cash. I pay most of my meals and small expenses with cash, some with credit card. About 200 USD/week, which I get from ATMs on campus.  My wife manages the rest of my salary, not quite sure how.

As for being an NF fan -- no, I don't usually care to ask for it in my private purchases. Most stores do provide it anyway. Often it is just a common cash register receipt, but printed by a special printer that also prints the tax audit copy in a continuous roll.

(Although I should be an NF fan, because the budget of our university  comes specifically from the São Paulo State sales tax revenue, and stores who do not issue NFs are evading that tax.)