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Pizza Bitcoin refers to the 10,000 BTC pizza purchase on May 22, 2010, a landmark moment that showed Bitcoin could buy real-world goods.
Bitcoin Day has no single official date. Most people mean Bitcoin Pizza Day, though some refer to the genesis block or white paper milestones.
Bitcoin Pizza Day marks an early real-world Bitcoin purchase. It matters because it showed Bitcoin could be used to buy something tangible.
Bitcoin Pizza Day is on May 22, a date remembered as an early moment when Bitcoin was used in a real-world purchase.
How many bitcoins were used to buy pizza? The answer is 10,000 BTC, a famous early example of Bitcoin being used for a real-world purchase.