The Bitcoin Pizza Day on May 22, 2010, marks the first time cryptocurrency was used for a real-world commercial transaction. Programmer Laszlo Hanyecz purchased two pizzas for 10,000 bitcoins, an act that, while seemingly ordinary, demonstrated the practical use of Bitcoin as a decentralized currency. This transaction broke the limitations of Bitcoin as merely a technological experiment, showcasing its potential in payment scenarios and laying the groundwork for the subsequent popularization of cryptocurrencies. At the time, participants may not have foreseen the future surge in Bitcoin's value, but this event provided critical evidence for the financial application of blockchain technology, encouraging more merchants and users to adopt cryptocurrencies.