Most receipts in my country have a qr code at the bottom with the link to the receipt in human and machine readable format. In the next year this will be mandatory for everyone. Russia.
I was going to ask, who came up with a dumb idea of using a link (i.e. URL) to access receipt data over the Internet, but fortunately it seems to not be the case - the QR code on the receipt posted by 'savant_d[0] reads:
[0] - https://news.ycombinator.com/item?id=17601617