Re: Criticize my tamper-proof paper wallet design... and steal 0.1 BTC if you can.
by
413j0
on 26/09/2013, 23:07:11 UTC
now candle it from the front, so the dispersion off the front obscuring pattern's light works in your favor, and if you did it correctly any part off the qr that touches the back obscuring pattern should be visible, but any part that is'n touching it should still scatter.
before photographing make sure to press gently on the white surface on the back so all the qr touches the pattern and therefore becomes clear.
in this step i can confirm that a cellphone light in a dark room is enough to make it perfectly clear to the human eye, so a good camera should be able to clearly pick it up.
if you notice the black shadow at right it's because this flash is faster than my cameras frame rate (60fps) and i couldn't light the whole frame, so under this conditions it's imposible to get my cellphone to focus or at least get any detail at all