Regarding privacy, sure, I doubt many people will want to pull out their cell phone at the grocery checkout, punch in a pile of notes and let everyone in line see how much cash they have. However, the proposed mobile interface is not intended nor would it be designed to accommodate entering multiple notes at a time. A common use case that I can think of would be getting a new note in change, then entering it when you get back to the car or something.
Regarding images of notes for new highs and lows, many phones these days have cameras. An image from a camera phone would certainly be acceptable so long as it is reasonably clear.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.