Two French researchers reconstructed a blurred QR code to gain access to a Bitcoin wallet that was holding $1,000. The money was put there by Bitcoin entrepreneur Roger Ver during a TV interview on the Bitcoin cryptocurrency with French TV station France 2. French laws prevented the TV station from showing the account’s private key and QR code. France 2 was not authorized to give out money prizes during that particular TV transmission, so it blurred out both details. The researchers spent 16 hours reverse-engineering the blurred image and piece together blurred dots in correlation with the QR code’s standard format.
Source: https://www.bleepingcomputer.com/news/technology/researchers-reconstruct-blurred-qr-code-to-gain-access-to-1-000-bitcoin-wallet/