Bitcoin: The First Decentralized Cryptocurrency

Satoshi Nakamoto published the Bitcoin whitepaper titled "Bitcoin: A Peer-to-Peer Electronic Cash System" on a cryptography mailing list. The paper proposed a decentralized digital currency using a proof-of-work consensus mechanism, solving the double-spending problem without a trusted authority. Nakamoto's true identity remains unknown.

Nakamoto mined the first block of the Bitcoin blockchain, known as the genesis block. Embedded in the block was the text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks," referencing a headline from The Times newspaper. On January 12, 2009, Hal Finney received the first Bitcoin transaction: 10 BTC from Nakamoto.

Programmer Laszlo Hanyecz made the first known commercial transaction using Bitcoin, purchasing two Papa John's pizzas for 10,000 BTC. At the time, 10,000 BTC was worth approximately 41 USD. This event is commemorated annually as Bitcoin Pizza Day and represents the first real-world valuation of the cryptocurrency.

The first Bitcoin halving occurred at block 210,000, reducing the block reward from 50 BTC to 25 BTC. The halving is a programmed event that occurs every 210,000 blocks (approximately four years) to control Bitcoin's supply, which is capped at 21 million coins. Bitcoin was trading at approximately 12 USD at the time.

Mt. Gox, the world's largest Bitcoin exchange at the time handling over 70% of all Bitcoin transactions, filed for bankruptcy in Tokyo. Approximately 850,000 BTC valued at over 450 million USD were lost or stolen. The collapse triggered a multi-year bear market and led to increased regulatory scrutiny of cryptocurrency exchanges worldwide.

The Segregated Witness (SegWit) upgrade was activated on the Bitcoin network to improve scalability and fix transaction malleability, laying the groundwork for the Lightning Network. Opponents who favored larger blocks forked from Bitcoin to create Bitcoin Cash, one of the most significant forks in Bitcoin's history.

The Chicago Mercantile Exchange (CME) launched the first Bitcoin futures contracts, marking the first time institutional investors could gain regulated exposure to Bitcoin. Bitcoin reached an all-time high of approximately 19,783 USD on the same day, capping a massive rally that had begun in early 2017.

The third Bitcoin halving reduced the block reward from 12.5 BTC to 6.25 BTC at block 630,000. Bitcoin was trading at approximately 8,600 USD at the time. The event preceded a massive bull run in 2020 and 2021, driven by institutional adoption from companies including MicroStrategy, Square, and MassMutual.

El Salvador became the first country in the world to adopt Bitcoin as legal tender, alongside the US dollar, following the passage of the Bitcoin Law in June 2021. The rollout faced technical difficulties, protests, and criticism from the International Monetary Fund. The government purchased Bitcoin for its national treasury using public funds.

The US Securities and Exchange Commission approved the first 11 spot Bitcoin exchange-traded funds (ETFs), including products from BlackRock, Fidelity, and Grayscale. The approval followed years of regulatory rejections and a court ruling in Grayscale's favor. The ETFs offered direct exposure to Bitcoin on American stock exchanges, marking a watershed moment for mainstream adoption.

Bitcoin's price crossed the 100,000 USD mark for the first time, driven by strong inflows into US spot Bitcoin ETFs and optimism about crypto-friendly policies under President-elect Donald Trump. BlackRock, the world's largest asset manager, recommended that investors allocate up to 2% of their portfolio to Bitcoin.

President Donald Trump signed an executive order to establish a strategic Bitcoin reserve under the US government, making Bitcoin a formal US reserve asset. Texas and New Hampshire subsequently instituted their own state-level Bitcoin reserves. The Czech National Bank also purchased Bitcoin in a test portfolio.