Bitcoin

• 1. Introduction

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  Bitcoin arrived in the world not with a press release or a bank announcement, but with a white paper posted to a cryptography mailing list on the 31st of October 2008. The author was listed as Satoshi Nakamoto. Nobody knew who that was. Nobody does to this day. What Nakamoto proposed was a system for digital money that needed no central authority, no bank, no government to function. The paper was not peer-reviewed. Academics who noticed it at first argued it could not work. Within months, the bitcoin network was live. Within a few years, it was being used to buy pizza, to run an underground marketplace, and to move hundreds of millions of dollars across borders. By 2021, a single country had made it the law of the land. By 2024, its price crossed $100,000. The questions bitcoin raises have never gone away: Is it money? Is it a bubble? Is it a threat? The answers depend on who you ask, and the list of people asking keeps growing.

• 2. Before Nakamoto

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  David Chaum had the idea first. In the 1980s, his ecash project sketched out a vision of digital money, but it required centralized control, and no bank wanted to sign on. The concept stalled. The next major step came in 1992, when cryptographers Cynthia Dwork and Moni Naor proposed that solutions to computational puzzles might carry real value. Their idea sat quietly in academic literature. Adam Back independently arrived at something similar in 1997, building a system called Hashcash that used proof of work to filter out email spam. Hashcash was useful, but it had no defense against double-spending: nothing stopped someone from copying a digital coin and spending it twice. In 1998, two cypherpunks tried to address this problem separately. Wei Dai designed b-money, and Nick Szabo designed bit gold. Both were vulnerable to a different weakness, called a Sybil attack, where a single bad actor creates many fake identities to game the network. Hal Finney brought these threads closer together in 2004, building the first currency based on reusable proof of work. Each attempt solved some problems while leaving others open. Nakamoto's contribution, according to computer scientist Arvind Narayanan, was not inventing new components but combining existing ones in a way that, for the first time, made the whole system work.

• 3. Genesis and Early Days

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  The domain name bitcoin.org was registered on the 18th of August 2008. By the 3rd of January 2009, the bitcoin network was running. Nakamoto mined the very first block, the genesis block, and embedded inside it a newspaper headline from that day's edition of The Times: "Chancellor on brink of second bailout for banks." The choice of text was not accidental. Nine days later, Hal Finney received the first bitcoin transaction: ten bitcoins sent directly from Nakamoto. Wei Dai and Nick Szabo, whose earlier work Nakamoto had drawn on, were also early supporters. The network existed, but it had no established price. That changed on the 22nd of May 2010, when programmer Laszlo Hanyecz paid 10,000 bitcoins for two Papa John's pizzas. That transaction is now commemorated annually as Bitcoin Pizza Day. Blockchain analysts later estimated that Nakamoto had mined around one million bitcoins before disappearing from public view in 2010, handing the network alert key and code repository over to developer Gavin Andresen. Andresen would go on to lead development at the Bitcoin Foundation, which was founded in September 2012.

• 4. Criminals, Regulators, and Crackdowns

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  Silk Road opened the way bitcoin became widely known to the public. Starting in February 2011, the dark-web marketplace accepted only bitcoin for its 30 months of operation, processing 9.9 million bitcoins worth roughly $214 million. Governments took notice. In March 2013, the US Financial Crimes Enforcement Network issued guidelines classifying bitcoin miners who sold their coins as money services businesses. That same year, US authorities seized Mt. Gox, an unregistered exchange. The Drug Enforcement Administration seized 11.02 bitcoins from a single individual attempting a drug purchase, the first time a US government agency had seized bitcoin directly. The FBI then seized around 30,000 bitcoins from Silk Road in October 2013, following the arrest of the site's founder, Ross Ulbricht. China moved in December 2013, with the People's Bank of China banning Chinese financial institutions from using bitcoin. Baidu stopped accepting it for services. The crackdown had immediate market effects: bitcoin's price dropped sharply after the announcement. China's hostility to bitcoin would deepen over the following years, with all cryptocurrency trading and mining banned outright in 2021, even as Chinese miners continued to operate and, as of October 2025, still held 14% of the global mining market.

• 5. How Bitcoin Actually Works

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  Every bitcoin transaction is recorded in a public ledger called the blockchain. Each block in that chain contains a cryptographic hash of the previous block, linking them in sequence. A new block is added roughly every ten minutes. The process of adding blocks is called mining, and it requires specialized computers to solve a mathematical puzzle: finding a number called a nonce that, combined with the block's contents, produces a hash below a specific target. The difficulty of this puzzle adjusts automatically every 2,016 blocks, about every two weeks, to keep the average block time steady. Miners who solve the puzzle collect transaction fees and a fixed reward paid in newly created bitcoin. All bitcoin in existence was created through these rewards. The total supply is capped at 21 million coins, a limit expected to be reached around the year 2140. After that, miners earn only from fees. One bitcoin can be divided down to eight decimal places. The smallest unit is called a satoshi, representing one hundred millionth of a bitcoin. Losing access to a private key means losing the coins it controls, permanently. In 2013, one user lost 7,500 bitcoins, valued at $7.5 million at the time, by accidentally discarding a hard drive. Estimates suggest around 20% of all bitcoins are permanently lost.

• 6. The Question of What Bitcoin Is

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  Economists have been arguing about bitcoin's nature since it first attracted serious attention, and the debate has not settled. The Economist, writing in 2014, said bitcoin worked best as a medium of exchange. Four years later, the same publication concluded it met none of the three criteria for a functional currency. Economist Robert J. Shiller, writing in 2014, suggested bitcoin had potential as a unit of account but did not solve any clear economic problem. Nobel Prize laureate Joseph Stiglitz argued that bitcoin's anonymity encourages money laundering. Jean Tirole, another Nobel laureate, called it a "pure bubble" in 2024, noting its intrinsic value is zero, while allowing that some bubbles, like gold, can persist indefinitely. Federal Reserve Chair Jerome Powell described bitcoin the same year as a digital competitor to gold but emphatically not to the dollar, citing its volatility and limited use as actual payment. The European Central Bank has traced bitcoin's philosophical roots to the Austrian school of economics, particularly Friedrich Hayek's argument for free-market money production. Sociologist Nigel Dodd frames the bitcoin project as an effort to remove money from both social and governmental control. In 2025, Kenneth Rogoff argued that bitcoin has genuine value as the preferred currency of the underground economy, which he estimated represents roughly 20% of world GDP, and that it could appeal to emerging-market central banks as a politically neutral reserve asset.

• 7. Institutions Move In

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  MicroStrategy invested $250 million in bitcoin as a treasury reserve asset in 2020. That same year, Square put in $50 million and MassMutual added $100 million. PayPal enabled bitcoin purchases for US users in November 2020. By February 2021, bitcoin's total market value crossed $1 trillion for the first time. The ProShares BITO fund, the first bitcoin futures ETF, was approved by the SEC and listed on the Chicago Mercantile Exchange in October 2021. Spot bitcoin ETFs, offering direct exposure without futures, finally arrived in January 2024, when eleven US funds began trading simultaneously. Bitcoin's price crossed $100,000 for the first time in December 2024, coinciding with president-elect Donald Trump's pledge to make the US the "crypto capital of the planet" and to build a strategic bitcoin reserve. BlackRock, the world's largest asset manager, recommended that month that investors allocate up to 2% of their portfolios to bitcoin. By March 2025, President Trump had signed an executive order establishing a strategic bitcoin reserve. States including Texas and New Hampshire followed with their own reserves. El Salvador, which had held bitcoin as legal tender since September 2021, still reported $550 million worth of bitcoin in its international reserves as of March 2025, around 6,102 coins, even after removing the legal obligation for businesses to accept it.

• 8. Mining's Hidden Costs

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  Bitcoin mining consumed enough electricity to draw comparison with a small country's national output. A study by the Cambridge Centre for Alternative Finance found bitcoin mining's share of global greenhouse gas emissions comparable to Slovakia's total emissions. About half of the electricity used in mining came from fossil fuels. Surveyed miners reported that 52% of their electricity came from sustainable sources. Mining hardware cycles through quickly, generating significant electronic waste. The US became the single largest mining country, holding 38% of the global bitcoin mining market share as of October 2025, followed by Russia at 16% and China at 14%. China's position was notable: the country banned all cryptocurrency trading and mining in 2021, yet Chinese mining operations continued. In 2014, the mining pool Ghash.io briefly reached 51% of the network's total computing power, the threshold at which a single actor could theoretically manipulate transactions. Ghash.io voluntarily reduced its share to 39.99%, but the episode illustrated a structural tension at the heart of bitcoin: a system designed for decentralization that keeps pushing toward concentration, as smaller miners join pools to earn stable income.