As an actual blind person, I appreciate the intent behind what they've done, but a much better solution would be to tactually mark currency. Canada has done this, among other countries. They put a certain number of dots on a bill depending on its denomination.

I tried one of these. It's around the size of a tic-tac box. Slip the bill in and push a button. After a second it'll tell you the currency denomination. It takes just long enough that you to never ever ever want to use it in public.

I think I'll stick to my Prime Rewards card for now. Maybe one day the Federal Reserve will get their shit together and add tactile features to the bank notes.