Bitcoin Explained: The Future of Decentralized Money

 Bitcoin Explained: The Future of Decentralized Money

Aim: 

To explore Bitcoin’s transformation into a mainstream financial asset through corporate adoption, national policy shifts, major network upgrades, NFT integration, and its emergence as a sovereign reserve asset.

Keywords:

Satoshi Nakamoto, Blockchain, Bitcoin white paper, Genesis block, Decentralized currency, Bitcoin Foundation, Silk Road, Bitcoin Cash, Bitcoin ETF, Taproot upgrade, Strategic Bitcoin reserve

Abstract:

The first decentralized cryptocurrency is called Bitcoin, which is shortened to BTC and has the symbol ₿. Bitcoin, which is based on the free-market philosophy, was created in 2008 when an unidentified person published a white paper using Satoshi Nakamoto's pseudonym. With the introduction of its open-source implementation in 2009, bitcoin was first used as a currency. It became legal tender in El Salvador in 2021. Since bitcoin is a pseudonym, authorities have become aware of its use by criminals, and as a result, some nations have banned it as of 2021.

Each computer serves as a node in the peer-to-peer bitcoin network, which is how Bitcoin operates. Without central control, every node keeps an autonomous copy of a publicly distributed record of transactions known as a blockchain. As long as the owner keeps some sensitive information private, transactions are verified by cryptography, which stops someone from spending another person's bitcoin.

Mining is a computationally demanding activity based on proof of work that is carried out by specially designed computers to reach consensus among nodes regarding the content of the blockchain. Mining has been criticized for its negative effects on the environment and for using a lot of electricity.

Introduction to Bitcoin

Bitcoin (₿), commonly abbreviated as BTC, is the first-ever decentralized digital currency. It was introduced in 2008 through a white paper published by an anonymous figure or group under the name Satoshi Nakamoto. The Bitcoin network officially launched in 2009 with the release of its open-source software. Since then, Bitcoin has evolved from a technical experiment into a global financial asset. In a landmark move, El Salvador recognized Bitcoin as legal tender in 2021. However, Bitcoin's anonymity and decentralization have also led to government restrictions and outright bans in several countries.

How Bitcoin Works

Bitcoin functions through a peer-to-peer network without central authority. Every participant, or node, stores a copy of a public ledger called the blockchain, which records all transactions. Transfers are secured by cryptographic algorithms, ensuring authenticity and preventing double-spending. Network consensus is achieved using a system called proof of work, where participants (miners) solve complex mathematical problems to validate transactions. While this system maintains security, it has drawn criticism for its high energy consumption.

Digital Currency Before Bitcoin

Several digital currency models emerged before Bitcoin, but none succeeded in creating a truly decentralized system. In the 1980s, David Chaum launched ecash, an early attempt at private digital payments. In 1992, Cynthia Dwork and Moni Naor introduced the idea of using computational puzzles to create value. Adam Back built on this in 1997 with Hashcash, which aimed to combat spam through proof of work. In 1998, cypherpunks Wei Dai and Nick Szabo proposed b-money and bit gold, envisioning decentralized digital assets. Hal Finney developed a system using reusable proof of work in 2004. However, these concepts failed due to centralization flaws, double-spending risks, and Sybil attack vulnerabilities.

History

A number of digital currency solutions were introduced prior to Bitcoin, starting with David Chaum's eCash in the 1980s. The cryptographers Cynthia Dwork and Moni Naor first suggested in 1992 that solving computational riddles might have value. Adam Back independently rediscovered this idea in 1997 when he created Hashcash, a proof-of-work system intended to counteract email spam. Cypherpunks Wei Dai and Nick Szabo made the initial suggestions for distributed, digital scarcity-based currencies in 1998. Hal Finney used reusable proof of work to construct the first currency in 2004.None of these systems were successful despite these efforts. Chaum's strategy required centralized management and was not accepted by banks. Hashcash was not protected against double-spending, and Sybil attacks could be used against b-money and bit gold.

2008–2009: The Birth of Bitcoin

The foundation of Bitcoin began with the registration of the domain bitcoin.org on August 18, 2008. Just a few months later, on October 31, an anonymous individual using the name Satoshi Nakamoto shared a white paper titled Bitcoin: A Peer-to-Peer Electronic Cash System on a cryptography mailing list. Although Nakamoto's true identity remains unknown, their work was built on earlier academic research. As noted by computer scientist Arvind Narayanan, all the components of Bitcoin had appeared in prior literature but Nakamoto’s breakthrough was combining them into a secure, decentralized, and Sybil-resistant system. This innovation marked the creation of what we now recognize as the first blockchain.

Despite initial academic skepticism and lack of peer review, Nakamoto moved forward. On January 3, 2009, the Bitcoin network officially launched with the mining of the first block known as the genesis block. Embedded in it was a symbolic message referencing the financial crisis:
“The Times 03/Jan/2009 Chancellor on brink of second bailout for banks.”

Just nine days later, Hal Finney received the first recorded Bitcoin transaction ten bitcoins from Nakamoto. Other early supporters included Wei Dai and Nick Szabo, pioneers of earlier digital currency concepts.

On May 22, 2010, Bitcoin saw its first real-world use when programmer Laszlo Hanyecz paid 10,000 BTC for two Papa John’s pizzas, an event now commemorated annually as Bitcoin Pizza Day.

2010–2012: Early growth

By 2010, Bitcoin began gaining traction. Blockchain analysts estimate that Satoshi Nakamoto mined about one million bitcoins before stepping away from the project. He handed over the network alert key and control of the Bitcoin code repository to developer Gavin Andresen, who later became lead developer at the Bitcoin Foundation, founded in September 2012 to support and promote Bitcoin.

In its early days, after initial test transactions, Bitcoin found one of its first major use cases in black markets most notably on the dark web marketplace Silk Road. Launched in February 2011, Silk Road operated for about 30 months, exclusively accepting Bitcoin and facilitating around 9.9 million BTC in transactions, worth roughly \$214 million.

2013–2014: First Regulatory Actions

As Bitcoin grew in popularity, governments began to respond. In March 2013, the U.S. FinCEN classified Bitcoin miners who sell their coins as money services businesses, requiring registration and compliance. That year, U.S. authorities seized the Mt. Gox exchange, and the DEA made the first Bitcoin seizure 11.02 BTC during a drug investigation. In October, the FBI confiscated 30,000 BTC from Silk Road after arresting its founder, Ross Ulbricht.

In December 2013, the People’s Bank of China banned financial institutions from using Bitcoin, causing its value to drop. Chinese tech giant Baidu also stopped accepting Bitcoin, reinforcing earlier laws that prohibited using virtual currencies for real-world purchases.

2015–2019: Adoption, Upgrades, and Volatility

By 2017, a University of Cambridge study estimated 2.9 to 5.8 million unique users held cryptocurrency wallets, primarily for Bitcoin. In August, the SegWit upgrade was implemented to improve scalability and support the Lightning Network. Disagreements over scaling led to a major split, resulting in the creation of Bitcoin Cash.

In December 2017, Bitcoin entered mainstream finance with futures trading on the Chicago Mercantile Exchange (CME). However, prices fell sharply in early 2018 after China's trading ban, reducing yuan-based Bitcoin transactions from over 90% to under 1%. The decline was worsened by several exchange hacks and thefts during the same year.

2020–2025: From Corporate Vaults to National Reserves 

What began as a quiet revolution turned into a financial awakening. In 2020, the corporate world took its first bold steps into Bitcoin. MicroStrategy made headlines with a $250 million investment, soon followed by Square and MassMutual, signaling that Bitcoin was no longer fringe; it was becoming treasury-grade. By 2021, Bitcoin had entered the big leagues. Its market cap hit $1 trillion, and the long-awaited Taproot upgrade unlocked new capabilities like Schnorr signatures and improved smart contracts. Bitcoin wasn’t just digital gold it was evolving. That same year, El Salvador shocked the world by declaring Bitcoin legal tender, and Wall Street took notice: the first U.S. Bitcoin futures ETF hit the market.

In 2022, Bitcoin proved its resilience not just as an asset, but as a tool for financial freedom. When Canadian trucker protests were cut off from traditional funding, they turned to Bitcoin. But the year wasn’t without turmoil: the crashes of TerraUSD and Celsius Network sent ripples through the crypto economy. Then came the next wave, 2023 saw the arrival of Ordinals NFTs inscribed directly onto the Bitcoin blockchain expanding its cultural and technical relevance. By mid-year, Bitcoin boasted 81.7 million users, roughly 1% of humanity.

In 2024, the tide turned institutional. The U.S. approved 11 spot Bitcoin ETFs, giving investors direct access through traditional stock markets. In December, Bitcoin breached $100,000 for the first time, driven by a political shift: President-elect Donald Trump vowed to make the U.S. the “crypto capital of the planet” and began accumulating Bitcoin at the national level. BlackRock soon followed, recommending investors allocate 2% of their portfolios to Bitcoin. The movement became policy in March 2025, when President Trump signed an executive order to create a strategic Bitcoin reserve. Inspired, Texas and New Hampshire also began stockpiling Bitcoin transforming the asset from private bet to public infrastructure.

Design

The primary unit within the Bitcoin system is known as a bitcoin, typically represented by the symbol ₿ and the currency code BTC. While BTC is widely used, it doesn't align with the ISO 4217 currency standard, as "BT" is already designated as Bhutan’s country code. An alternative code, XBT, is occasionally used (such as by Bloomberg) because it follows ISO 4217's convention of using "X" for non-sovereign currencies, though it’s not officially recognized.

There is no universally accepted rule for capitalizing the word "bitcoin." Some distinguish between "Bitcoin" (referring to the network or protocol) and "bitcoin" (for the currency unit), while other dictionaries use both forms interchangeably.

One bitcoin can be broken down into eight decimal places. Smaller units include the millibitcoin (mBTC), which equals one-thousandth of a bitcoin, and the satoshi (sat), the smallest denomination, worth one hundred-millionth of a bitcoin. Notably, 100,000 satoshis equals one millibitcoin.

Units and Divisibility 

The fundamental unit within the Bitcoin system is called the bitcoin, typically symbolized by ₿ and abbreviated as BTC. Although BTC is widely used, it does not adhere to the ISO 4217 currency coding standard, as "BT" is already the country code for Bhutan. To align with international norms, which require global asset codes to begin with "X", the alternative code XBT is sometimes used—such as by financial services like Bloomberg—though it isn't officially part of the ISO standard.

There’s no single rule for capitalization: many distinguish between "Bitcoin" (capitalized) when referring to the system or protocol, and "bitcoin" (lowercase) when referring to the currency. However, major dictionaries like the Cambridge and Oxford Advanced Learner's Dictionaries use both forms interchangeably.

A single bitcoin can be split into 100 million smaller units, allowing for precise transactions. Smaller denominations include the millibitcoin (mBTC), which is one-thousandth of a bitcoin (0.001 BTC), and the satoshi (sat), the smallest unit, equivalent to 0.00000001 BTC. To put it another way, 100,000 satoshis make up one millibitcoin.

Recognition as a Currency and Legal Status 

Bitcoin is often debated in terms of its function as a currency. Traditionally, money serves as a store of value, medium of exchange, and unit of account. According to The Economist in 2014, Bitcoin was most effective as a medium of exchange, though by 2018, they argued it didn’t fully meet any of the traditional functions of money. Other economists have been divided by Robert J. Shiller saw potential in Bitcoin as a unit of account, while François Velde of the Chicago Fed praised it as a clever solution for digital currency. Some, like David Andolfatto of the St. Louis Fed, even considered it a useful challenge to central banks, pushing them to maintain sound monetary policies.

The legal status of Bitcoin differs greatly between countries. Some nations encourage its use, others place restrictions, and some have outright banned it. Its decentralized design and international accessibility make regulation difficult. Nevertheless, its use by criminals has drawn attention from governments, with Joseph Stiglitz and others criticizing its anonymity for enabling money laundering. As of late 2021, nine countries, including China and Egypt, had completely banned Bitcoin, while 42 others had some form of partial or implicit restriction. At that time, only El Salvador had recognized Bitcoin as legal tender.

In practical use, Bitcoin is rarely used for everyday purchases. According to Harvard economist Kenneth Rogoff, Bitcoin is more common in the informal and illicit economies than in mainstream commerce. High transaction costs, price volatility, slow processing times, and the lack of chargebacks discourage its widespread retail use. Most sellers still price goods in fiat currencies, with Bitcoin transactions requiring currency conversion. While some large purchases have occurred—such as on Overstock.com and some freelancers have accepted cross-border Bitcoin payments, international remittances remain minimal despite potential cost advantages.

In September 2021, El Salvador passed a law declaring Bitcoin legal tender, alongside the U.S. dollar. The move was controversial, facing domestic resistance and criticism from organizations like the IMF, which urged the country to reconsider. By 2022, surveys showed that 80% of Salvadoran businesses were still not accepting Bitcoin. A similar experiment by the Central African Republic in 2022 was reversed in 2023.

Some governments have found strategic uses for Bitcoin. Iran, initially skeptical, began requiring miners to sell their Bitcoin to the central bank, which used it for imports. In the U.S., certain states such as Colorado and Switzerland's Zug canton accept Bitcoin for tax payments. Meanwhile, the U.S. federal government held over $5 billion worth of seized Bitcoin as of 2023.

Bitcoin Use for Payments

While Bitcoin is accepted at select locations like a café in Delft, its everyday use for transactions remains limited. As of 2025, Harvard’s Kenneth Rogoff notes it's rarely used for typical purchases and is more prevalent in informal or illicit markets. Reasons for this include high transaction fees, volatility, slow processing times, and a lack of chargeback options.

In 2021, El Salvador made Bitcoin legal tender alongside the US dollar. However, uptake has been minimal, with around 80% of businesses not accepting it, and the IMF later urged reversal of the decision. The Central African Republic briefly followed suit in 2022 but repealed the law a year later.

Some governments have found alternative uses. Iran, for example, requires miners to sell Bitcoin to its central bank to finance imports, bypassing sanctions. Regions like Colorado (US) and Zug (Switzerland) accept tax payments in Bitcoin. By 2023, the US government held over $5 billion worth of seized Bitcoin.

Conclusion

Bitcoin has evolved from a niche digital experiment into a global financial phenomenon, influencing everything from personal finance to national economic policies. Despite volatility and regulatory hurdles, its adoption by corporations, governments, and individuals highlights growing recognition of its potential as a decentralized store of value and medium of exchange. As innovation around Bitcoin—such as smart contracts, NFTs, and ETFs—continues, its future will likely be shaped by technological advancements, legal clarity, and broader integration into traditional financial systems.

References:

1. Jump up to: a b Nakamoto, Satoshi (2008). Bitcoin: A Peer-to-Peer Electronic Cash System. Archived from the original on 31 October 2008. Retrieved 27 July 2025.

2. Vigna, Paul; Casey, Michael J. (2015). The Age of Cryptocurrency: How Bitcoin and Digital Money Are Challenging the Global Economic Order. St. Martin's Press. ISBN 978-1-250-06174-1.

3. Catalini, Christian; Gans, Joshua S. (2016). "Some Simple Economics of the Blockchain". MIT Sloan Research Paper No. 5191-16. SSRN 2874598.

4. Yermack, David (2013). “Is Bitcoin a Real Currency? An Economic Appraisal.” NBER Working Paper No. 19747. National Bureau of Economic Research. doi:10.3386/w19747.

5. Böhme, Rainer; Christin, Nicolas; Edelman, Benjamin; Moore, Tyler (2015). “Bitcoin: Economics, Technology, and Governance.” Journal of Economic Perspectives. 29 (2): 213–238. doi:10.1257/jep.29.2.213.

6.  European Central Bank (2012). “Virtual Currency Schemes.” ECB Occasional Paper Series. Archived from the original on 27 July 2025.

7. Zohar, Aviv (2015). “Bitcoin: Under the Hood.” Communications of the ACM. 58 (9): 104–113. doi:10.1145/2701411.

8. Tapscott, Don; Tapscott, Alex (2016). Blockchain Revolution: How the Technology Behind Bitcoin is Changing Money, Business, and the World. Portfolio. ISBN 978-1-101-90207-2.

9. World Bank (2021). “Cryptocurrency Regulation in Developing Countries.” Global Financial Development Report. Archived from the original on 15 August 2022.

10. Financial Action Task Force (FATF) (2019). “Guidance for a Risk-Based Approach to Virtual Assets and Virtual Asset Service Providers.” Archived from the original on 20 September 2022.