It’s not an official holiday – yet – but for many cryptocurrency enthusiasts “Bitcoin Pizza Day” is still special. Thursday marks the 15th anniversary of the first known use of cryptocurrency to buy real-world goods. The 10,000 bitcoin that software developer Laszlo Hanyecz paid for two Papa John’s pizzas delivered to his Florida home on May 22, 2010, were worth about $41 at the time. Today they’re worth $1.1 billion, as bitcoin hits record high prices. Several cryptocurrency companies are announcing promotions and other celebrations to mark Bitcoin Pizza Day..