Bitcoin Pizza Day is an important anniversary celebrated by the cryptocurrency community every year on May 22, aimed at commemorating the first physical transaction in Bitcoin history. On May 22, 2010, programmer Laszlo Hanyecz from Florida, USA, posted on the Bitcoin forum proposing to exchange 10,000 bitcoins for two pizzas. Eventually, a user named Jeremy Sturdivant accepted his proposal and ordered two pizzas worth about $25 to be delivered to Hanyecz's home using a credit card. This transaction not only marked the first time Bitcoin was used to purchase a physical product but also became a milestone event in the transition of cryptocurrency from theory to real-world application.