14 minsPublished on 2/10/2023

What is Bitcoin (BTC)?

A comprehensive beginners guide to the world’s first bonafide cryptocurrency.

By Sankrit K

From its humble beginnings as an idea in a whitepaper, Bitcoin has grown into a global phenomenon that has challenged traditional financial systems and inspired a new generation of digital currencies.

Some even argue that cryptocurrency cannot be comprehended without first understanding Bitcoin. So, what is it that makes BTC, the largest cryptocurrency by market capitalization, so special? And how did it change the course of monetary history?

This article explains the history of Bitcoin, how it differs from other cryptocurrencies, and where you can buy BTC.

What is Bitcoin?

Bitcoin is a type of digital currency that allows people to make online transactions without the need for an intermediary such as a bank.

The unique thing about Bitcoin is that it is decentralized, meaning no government or organization controls it. Instead, transactions are verified and recorded on a public digital ledger called the blockchain.

Bitcoin is an open-source project, which means anyone can contribute to its developement. At the same time, its decentralized nature ensures no one person is able to sabotage it.

To understand why Bitcoin is special, we need to first have an elementary understanding of the role money plays in society.

Medium of exchange

In its most basic form, money is an agreed-upon medium of exchange. It is a way to simplify and standardize trade so that people can buy and sell without having to barter.

People used to use commodities like gold and silver as money. The problem with commodities, however, is that they are difficult to transport and divide. This made trade complex and impractical.

Paper money was created as a way to make trade easier. The government or a central authority would issue paper money that people would then use to buy and sell goods and services.

This is the way money has worked for thousands of years, but the further we progress into the digital age, many problems with traditional money are beginning to come to light.

Problems with traditional money

There are four major problems with traditional money (paper and digital):

  1. Double spending

  2. Inflation

  3. Centralization

  4. Trust

Bitcoin presents itself as a solution to all four.

1. Double spending

Double spending is a problem unique to digital currencies. It occurs when a user spends the same currency twice, or more specifically when they send the same digital token to two different recipients. While this may sound like a trivial issue, it can have major consequences for businesses and consumers who use digital currencies.

Bitcoin solves the double spending problem by using a data structure called a blockchain. In a blockchain, a “block” is simply a collection of data that contains information about multiple transactions. Each block is linked to the previous block and secured using cryptography, forming a chain of blocks (hence the name “blockchain”). 

If someone tries to spend the same bitcoin twice, they will have to create two separate blocks, and thus two different versions of the blockchain. This makes it easy for others to spot the fraud and reject one of the blocks.

2. Inflation

Inflation is a problem that all fiat currencies face. It is the currency’s gradual loss of purchasing power over time.

The causes of inflation are many and varied, like the government printing more money. The end result, however, is always the same: each unit of the currency buys less than it did in the past.

Inflation is a particular problem for savers. When the prices of goods and services rise, the purchasing power of their savings falls. This can result in a loss of real value over time.

Bitcoin solves inflation by capping its total supply. There will never be more than 21 million bitcoins in existence, and each Bitcoin can be divided into 100 million units. This makes the currency highly available to anyone who wants to use it, without the issue of inflation eroding its value.

3. Centralization

Centralization is a big problem for any kind of digital currency. It occurs when there is too much power in too few hands.

This can take many forms, like when an entity has too much control over a network or too much control over the currency itself. Centralization is a big problem because it makes the system vulnerable to manipulation and corruption.

Bitcoin solves the centralization problem by using a decentralized network of “nodes” (devices that keep the blockchain running) to validate transactions and create new blocks. This means that no single entity has too much power over the network.

4. Trust

Although the traditional financial system is good enough for some, there are still several shortcomings. 

Payment gateways, banks, and other intermediaries can get hacked, making it more difficult for businesses and consumers to trust them.

Bitcoin solves the issue of trust by offering a trustless payment model that is made possible by the use of cryptographic signatures (a mathematical technique to authenticate transactions). When a user wants to send BTC to another user, they sign the transaction with their private key, a 256-character binary code. This signature is then verified by the network to ensure that the transaction is valid.

How was Bitcoin created?

In 2008, a research paper titled "Bitcoin: A Peer-to-Peer Electronic Cash System" was published under the pseudonym Satoshi Nakamoto. In the paper, Bitcoin was presented as a solution to many of the problems faced by traditional money, with special emphasis given to the double spending problem.

The paper sparked a lot of interest among developers who saw potential in Nakamoto’s idea, andn 2009, the vision outlined in the nine-page document manifested into the world’s first fully decentralized cryptocurrency: Bitcoin.

Bitcoin officially launched when its first block was mined.

Nakamoto continued to work on the project until 2010, when he handed over control of the Bitcoin code repository to Gavin Andresen. He then disappeared, which to this day has fuelled speculation regarding his whereabouts.

How does Bitcoin work?

The Bitcoin network is decentralized, which means there is no central authority controlling it. Transactions are verified by network nodes and recorded in a public ledger called a blockchain.

What are nodes and how do they verify transactions? 

For this, we’ll need to introduce two more concepts:

  1. Proof of Work consensus mechanism

  2. Bitcoin mining

Proof of Work consensus mechanism and mining

A consensus mechanism is a mathematical model that ensures all participants of a cryptocurrency blockchain network act honestly, without any cheating or fraud.

Proof of Work (PoW) and Proof of Stake (PoS) are two of the most popular consensus mechanisms in use today by blockchains. PoW is what’s used by the Bitcoin network.

In PoW, transactions are verified by nodes, also called “miners.” These miners compete to verify transactions by solving complex mathematical puzzles. The first miner to solve the puzzle gets to add the next block to the blockchain and receives a reward in bitcoins.

The Bitcoin network has a built-in mechanism to adjust the difficulty of the puzzle so that a new block is added to the blockchain every 10 minutes on average.

Why does Bitcoin use the PoW consensus model?

The PoW consensus model was chosen for Bitcoin because it is the most secure consensus model. Below are a few reasons.

1. Resistance to 51% attacks

A 51% attack is a potential vulnerability in a blockchain network in which an attacker who controls more than half of the network's computing power can manipulate the system and double-spend tokens, block legitimate transactions, and rewrite transaction history.

This type of attack can compromise the security and integrity of a blockchain.

In a PoW system, it is very difficult for an attacker to control more than 50% of the network. This is because in order to add a new block to the blockchain, an attacker would need to control more than 50% of the mining power in the network.

2. Resistance to Sybil attacks

The PoW consensus model is also very resistant to something called a “Sybil attack”.

A Sybil attack is when an attacker creates multiple fake identities in order to gain control of the system.

In a PoW system, it is very difficult for an attacker to create multiple fake identities because each identity requires computing power.

3. Resistance to DoS attacks

The PoW consensus model is also very resistant to Denial of Service (DoS) attacks.

A DoS attack is when an attacker tries to prevent legitimate users from accessing the system. In a PoW system, it is very difficult for an attacker to prevent legitimate users from accessing the system because he or she would need to control more than 50% of the computing power in the network.

What is Bitcoin used for?

There are a few notable use cases for Bitcoin:

1. Borderless money transfer

Bitcoin has made it possible to send money to anyone in the world quickly and cheaply without the need for a bank or other financial institution. All you need is an internet connection and a public address.

For instance, BTC worth over $2 billion was transferred anonymously on September 9, 2021 for fewer than $1 in fees. Private value transfer of such magnitude would not be possible with traditional finance tools.

2. Store of value

Bitcoin has often been referred to as "digital gold". This is because it has many of the same properties as gold: it’s scarce, durable, divisible, and portable.

In addition, Bitcoin has a number of advantages over gold. For instance, it is much easier to store and transport Bitcoin than it is to store and transport gold. 

3. Investment diversification

The emergence of Bitcoin, for many investors, is a brand new asset class.

While some of these investors may be oblivious to its technological capabilities, they still consider BTC to be an investment vehicle capable of hedging risk and increasing returns .

4. Borrowing

Albeit not recognized as an asset by most government entities around the world, there are several DeFi protocols that allow users to borrow fiat at relatively low-interest rates by collateralizing their BTC holdings.

5. Company strategy

Several companies have announced Bitcoin strategies. For example, in late 2020, Square announced that it had purchased $50 million worth of BTC.

MicroStrategy, another publicly listed US company, holds over 125,000 BTC for a purchase price of about $4 billion.

Such companies are betting on BTC as a hedge against inflation.

6. Geopolitical strategy

When Ukraine's payments infrastructure took a massive blow due to the Russian invasion, the government began accepting Bitcoin and other cryptocurrencies as a form of aid from other countries.

Halfway across the world, El Salvador made headlines for becoming the first country to accept Bitcoin as legal tender. In 2021, the government has even announced that all citizens will be able to pay their taxes in BTC.

Bitcoin’s limitations

While Bitcoin has many advantages over traditional fiat currencies, it also has some limitations:

1. Unregulated

Since Bitcoin is decentralized and not under the control of any government or financial institution, it is not subject to any regulations. This lack of regulation could be seen as a good or bad thing, depending on one’s perspective.

Some people see it as a good thing because it means that the currency is not subject to inflationary pressures or other manipulation by central authorities. Others see it as a bad thing because it means there is no one to protect you if something goes wrong, e.g., your BTC is stolen by a hacker.

2. Volatile

The price of Bitcoin has been known to fluctuate greatly, which can make it difficult for people to use it as a store of value orpayment for day-to-day purchases.

If you are holding Bitcoin as an investment for the long term, then you may be able to weather the volatility. If you intend to use it for purchases, however, then volatility can be a big limitation.

3. Limited acceptance

Although Bitcoin is gaining in popularity, it is still not accepted as a form of payment by most businesses. This means that you may not be able to use it to pay for all of the goods and services that you want.

Some businesses are hesitant to accept Bitcoin because of its volatility, while others simply do not know how to accept it. 

4. Not built for advanced financial applications

Bitcoin was designed as a digital currency with one simple goal: to exchange value peer-to-peer. It did not account for other financial activities like borrowing, lending, and contractual agreements.

This means that it is not well-suited for more advanced financial applications. For these, you may want to look into other digital currencies like Ethereum.

While the Bitcoin network is constantly evolving to meet the needs of the ever-shifting financial landscape (like with the Bitcoin Taproot upgrade), it is still not as robust or feature-rich as some of the other cryptocurrencies available today.

5. Large carbon footprint

The Proof of Work consensus mechanism that Bitcoin uses has a large carbon footprint.

This is because the miners who secure the network need to use a lot of energy to power their computers.

As the price of Bitcoin goes up, more miners are incentivized to join the network, thus increasing the competition and energy usage of the network. This in turn causes Bitcoin’s total energy consumption to rise.

6. Poor scalability

The Bitcoin network can only process four to five transactions per second. To put this in perspective, Visa can process 1,700 transactions per second.

This is a big problem because as Bitcoin becomes more popular, the demand for transactions on the network will increase, creating long processing delays and potentially preventing some people from using Bitcoin.

This compromise in scalability, security, and decentralization is what Vitalik Buterin, the creator of Ethereum blockchain, dubbed the "Blockchain Trilemma".

How is Bitcoin different from other cryptocurrencies?

While Bitcoin is not the only cryptocurrency, it is different from all others for a variety of reasons.

First and foremost, Bitcoin is the original cryptocurrency, launched in 2009. Every other cryptocurrency is known as an alternative coin, or “altcoin” since each one was developed after Bitcoin.

Secondly, Bitcoin has by far the largest and most active community of developers working on it. More than 600 people have contributed code to the Bitcoin Core project in the past year alone. This means there is a lot of talent and resources being used to making Bitcoin better.

Finally, Bitcoin is the most decentralized cryptocurrency. There is no centralized authority or company that controls Bitcoin. Instead, it is maintained by a global network of computers that anyone can join. Most of the other cryptocurrencies have fewer miners or validators, which makes them less decentralized than the Bitcoin network.

Bitcoin Pizza Day

Although Bitcoin launched in 2009, there was not yet any real-world use cases for it,and no company was ready to accept it. In fact, most people weren’t even aware of its existence.

This all changed on May 22, 2010, when Florida-based programmer Laszlo Hanyecz made the first real-world purchase using Bitcoin. He bought two pizzas from a Papa John's outlet for 10,000 BTC, which at today's prices is worth millions.

This event is now celebrated as Bitcoin Pizza Day every year on May 22, and serves as a reminder of how Bitcoin can be used to buy real-world goods and services.

Interesting facts about Bitcoin

  • While BTC is the abbreviation used by exchanges and most people, the ISO-prescribed abbreviation for Bitcoin is "XBT."

  • Bitcoin is deflationary in nature. It has a maximum supply of 21 million BTC.

  • The last Bitcoin will be mined in the year 2,140.

  • Experts predict that after the last Bitcoin is mined, the network fee will be the incentive for miners to keep the blockchain running.

  • The first peer-to-peer Bitcoin transaction was between Satoshi Nakamoto and Hal Finney, who was once Bitcoin’s lead developer. Nakamoto transferred 10 BTC as a test transaction.

How to buy Bitcoin (BTC)

If you are looking for an easy and straightforward way to buy BTC with your local currency, MoonPay has you covered.

With MoonPay, you can buy Bitcoin instantly with a credit or debit card, bank transfer, Apple Pay, Google Pay, and more.

Sankrit K
Written bySankrit K