Just curious. Has no one attempted to cover up the QR code to another QR code in an attempt to steal donations? Well done by the way. I think I remember the last time you've posted your art here. Has it really been 2 years? Jeebus.
Now that he has come out and said he's received $12,500 over a couple of years, he might just be asking for trouble.
That being said, it requires specialized equipment to produce QR codes that big, so it would have to be a really dedicated individual to go through the effort.
Where are the locations of your Frescos @OP? Would be nice to see them scattered throughout the world!
On the 5 murals, there's still 2. The both are very close at 63 rue Riquet Paris 75019, look on google street, you can see them on the bridge.