Update: In 2013 a piece was put up that contained a QR code to a Bitcoin wallet. As an experiment 100$ worth of Bitcoin were loaded onto it and never touched. At its lowest it was worth 20$, today this piece still contains the original 0.1BTC and is worth 1500$.



QR Code: 1AThjkNQuYYghJnhRvUG7BWaLJZtjPdEXW