Bitcoin

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First Real-World Transaction: The first known commercial transaction using Bitcoin was in 2010 when Laszlo Hanyecz paid 10,000 BTC for two pizzas. Today, that amount is worth hundreds of millions of dollars.

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Limited Supply: There will only ever be 21 million Bitcoins in existence. This scarcity is built into the code and is one of the reasons Bitcoin is often compared to gold.

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Lost Bitcoins: It is estimated that around 20% of all Bitcoins (approximately 3.7 million BTC) are lost forever due to lost private keys or forgotten wallets.

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Bitcoin Pizza Day: May 22 is celebrated as Bitcoin Pizza Day to commemorate the first Bitcoin transaction for pizza.

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Satoshi's Identity: The true identity of Satoshi Nakamoto remains unknown. Many people have been speculated to be Satoshi, but no one has been confirmed.

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Bitcoin's Smallest Unit: The smallest unit of Bitcoin is called a Satoshi, named after its creator. One Satoshi is equal to 0.00000001 BTC.

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Energy Consumption: Bitcoin mining consumes a significant amount of energy. In fact, the Bitcoin network's energy consumption is often compared to that of entire countries, such as Argentina or Norway.

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First Bitcoin ATM: The world's first Bitcoin ATM was installed in Vancouver, Canada, in October 2013.

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Bitcoin Halving: Approximately every four years, the reward for mining Bitcoin is halved in an event called the Bitcoin Halving. This reduces the rate at which new Bitcoins are created and contributes to its scarcity.