What Is Bitcoin & How Does It Work?

What Is A Bitcoin?

Bitcoin is a digital currency payment network developed in 2008 outside of existing governing financial systems. Satoshi Nakamoto outlined the parameters of Bitcoin in the white paper as a “Peer-to-Peer Electronic Cash System” without intermediaries from financial exchanges. The objective of Bitcoin is to create a transparent, immutable, and censorship-resistant digital currency to send payments from one party to another. It was the first blockchain network to become mainstream and launch a new asset class known as cryptocurrencies.

Key facts about Bitcoin include:

  • There will only be 21 million Bitcoin ever created.
  • 18.92 million Bitcoins have been created so far.
  • The current mining reward is 6.25 BTC per block mined.
  • Roughly 900 BTC are mined every day based on the current reward.
  • The last Bitcoin is expected to be mined in the year 2140.
  • The average speed to send Bitcoin is 11 minutes.

What Can Bitcoin Be Used For?

Bitcoin has many use cases or applications that depend on the person who purchased or transferred the digital asset. The main purposes of Bitcoin include as an investment, as a store of value or recession-proof investment (e.g. digital gold) and to transfer value to another person or business over the internet. Several companies accept Bitcoin as payment for goods and services. A recent example is the social media company Twitter which has launched a new tipping feature. Users can gift money in the form of Bitcoin to Twitter accounts in the form of a tip.

Why Do People Buy Bitcoin?

Bitcoin is a popular asset for investors instead of using it as a digital currency as it was originally intended in the whitepaper. Initially, users purchased Bitcoin to conduct anonymous online transactions on the dark web. However, as anonymity shifted away from Bitcoin using centralized cryptocurrency exchanges, investors who understand the fundamental aspects of limited supply and growing demand have altered the perception from a digital currency into an investable asset. Others even believe that Bitcoin could become a global reserve currency alongside the US Dollar.

Early adopters used Bitcoin to make everyday purchases. For example, the well-known million-dollar pizza BTC pizza was purchased in 2010. As its popularity increased among individuals, its application as a currency stalled due to heightened volatility. Investors turned to hold the digital asset to appreciate in price in the hopes of becoming the next Bitcoin millionaire.

Is Bitcoin Worth Investing In?

Investors who understand the fundamental aspects of limited supply and growing demand realize the shift from a digital currency into an investable asset value. Bitcoin is currently the 9th largest investable asset with a total market capitalization of $835.78 Billion at the time of writing. According to statistics, there are currently approximately 81 million Bitcoin wallets that were created to buy, hold and store Bitcoins. Given the fixed amount of Bitcoins and growing interest, the supply and demand equation suggests a favorable outcome. Moreover, Bitcoin can hedge against increasing inflation due to the uncontrolled printing of fiat currencies.

Bitcoin market cap compared to other assets
Bitcoin market cap compared to other investable assets. Source: Companiesmarketcap.com

What Are The Pros & Cons of Bitcoin?

Bitcoin developed as an alternative form of currency to the broken financial system. The pros of using Bitcoin for digital payments are that it's censorship-resistant, meaning any third party cannot alter its network and usability. It is also immutable and transparent, meaning every transaction on the Bitcoin blockchain can be seen by anyone, which can help decrease loose ends in any organization. Furthermore, Bitcoin does not rely on intermediaries to process transactions. Thus reducing processing speed and Bitcoin transaction fees for cross-border transactions compared to traditional finance.

What about the costs? How much it costs to send a Bitcoin transaction.

Bitcoin ProsBitcoin Cons
No central authority or Government can control itTransactions are slow for everyday purchases
Limited supply that cannot be manipulatedNot widely accepted as a form of currency
Widely accessible with increasing liquidityFaces unknown regulatory risk by Governments
Solves the double spend problemDifficult to use as currency due to high volatility
Transactions are verifiable on a public ledgerSteep learning curve to buy, hold and send
Bypasses traditional banking feesHard to reverse a transaction once made

On the other hand, Bitcoin is a relatively slow network compared to other forms of payment such as credit cards and other cryptocurrencies. One of the biggest risks with Bitcoin is regulation and Government policies. As an unregulated asset or form of currency in most countries, Governments can ban Bitcoin at any time.

A recent example is China, which blacklisted Bitcoin, mining, and any banks dealing with cryptocurrencies. Another limitation is the high energy resources required to mine Bitcoin to validate transactions and create new Bitcoins.

How Does Bitcoin Work?

Bitcoin is a decentralized payment system that is open, secure, and public. The 3 major components involved with how it works are the blockchain network, wallets and Bitcoin miners. Each component plays a vital role in sending, verifying and receiving Bitcoin from one wallet to another.

1. Blockchain Network

Bitcoin was the first cryptocurrency that used blockchain technology to track every transaction cryptographically. As the name implies, the blockchain is a distributed digital record that accounts for every transaction on the network. The blockchain is made of blocks that can fit a specific number of transactions. Every transaction contains a date and time, total value, buyer and seller, and a unique identifying code.

The blockchain is a distributed public ledger, meaning everyone can access it, and every transaction can be viewed and audited by the public. This makes it possible to trace Bitcoin by finding the Bitcoin transaction ID. This is in due part to the blockchain using cryptographic logic to track accountable wallet balances. Each transaction then helps the network keep track of the exact wallet balance as the network uses chronological block order to exact.

Bitcoin hashrate from the whitepaper diagram
How bitcoin transactions work. Source: Bitcoin White Paper.

2. Bitcoin Miners

Miners are what make the Bitcoin network operate. They provide the necessary processing power to verify transactions on the blockchain and keep balances in check. Miners are rewarded for their network contribution; however, Satoshi Nakamoto added a condition that increases the pay-out difficulty based on the number of miners that make up the network. Miners are the ones who change the numbers in users' wallets and make sure that transactions are approved between users.

Moreover, a process called Bitcoin halving was introduced after the genesis block in 2009 to moderate the speed at which new Bitcoins are rewarded to miners. Essentially, the halving occurs roughly every 4 years and reduces the miner's reward for each block mined. This increases the longevity of the network by continuing to incentivize Bitcoin miners without endangering the value of the network too quickly.

3. Bitcoin Wallets

Bitcoin wallets are a major component of how transactions on the Bitcoin network are transacted between persons. Wallets can take the form of a physical device, software or mobile phone application. Each type of Bitcoin wallet comprises two critical components of a Bitcoin wallet to send and receive transactions on the blockchain.

Ledger nano X
Ledger Nano wallet to store Bitcoin.

The first is the public key, or a user's Bitcoin (username), which is used for people to send and receive transactions. The public keys are cryptographically generated and include a hash number that can be shared with anyone. There are minimal risks associated with sharing the wallet address unless users want to stay somewhat anonymous. An example of a Bitcoin public address is shown below, however, the most common representation is a unique QR code that can be copied and pasted easily to send Bitcoin to another wallet.


Secondly, private keys are the seed phrases used to sign off transactions. Bitcoin private keys are secret numbers that prevent other users from accessing their wallets, protecting them from theft. A private key also helps users access their Bitcoin wallets from anywhere in the world. The key can also be used to recover Bitcoins from a hardware wallet that has been physically lost or stolen. An example of a Bitcoin key in the hexadecimal format is:


In most cases, Bitcoin owners will not use the private key in its numerical value to access their wallets. A simple root seed phrase (like a password) is generated with each Bitcoin wallet which is used to encode the private key for ease of use.

What Is Bitcoin Mining?

Bitcoin implements a consensus mechanism called proof-of-work, where miners solve complex mathematical equations to add new transactions to the blockchain. Bitcoin's consensus mechanism denotes that new blocks are generated and added to the blockchain approximately every 11 minutes.

Bitcoin mining involves powerful supercomputers to solve mathematical equations. In return, the miners are rewarded with a miners fee of 6.25 BTC per block which is added to the circulating supply as new Bitcoins. As the Bitcoin network is self-regulatory, the difficulty of solving an equation increases according to the number of active miners on the network. As a result, miners use Bitcoin mining pools by adding together all the processing power to increase the chances of receiving the miner's reward. Some of the most popular mining pools are Slush Pool, Binance Pool, AntPool, and BTC.com.

Bitcoin miners
Bitcoin miner GPU's.

ASIC miners which are heavy energy-dependent machines are used to mine Bitcoin. Mining Bitcoin was initially profitable using mobile phones and consumer-grade video cards; however, as computation demand increased, video cards could no longer meet the network demands. Individuals who build their own Bitcoin miners and join a pool of multiple miners can increase the likelihood of finding a block reward. The Bitcoin mining rig is connected to software via the Internet or other communications technology which integrates the hardware into the Bitcoin network. The software can be used to monitor performance, power consumption, and earnings. It is therefore essential to pair the mining rig with the Bitcoin mining software to optimize and manage the mining process.

In short, Bitcoin mining is the process of adding new blocks to the blockchain by solving complex equations containing a group of transactions during a set period. In addition, miners are validators, ensuring that transactions are approved and added to the network.

Related: How to mine Bitcoin: What you need to know.

Is Bitcoin Safe?

There are many factors to how Bitcoin has been designed that make the blockchain secure to use. Bitcoin uses cryptographic data to conduct Peer-to-peer (P2P) transactions. Each transaction that occurs on the network is irreversible and permanently stored on the blockchain. The application of unique private keys and digitally encoded transactions that are protected by Elliptic curve cryptography are near-impossible to successfully penetrate. As Bitcoin is not developed by any government or central body, its value is assisted by the trust users place in its network and its growing adoption. To date, the Bitcoin network has never been hacked or compromised.

Is Bitcoin A Good Investment?

Bitcoin and other cryptocurrencies such as Ethereum, in general, are highly volatile assets because they are part of an unregulated market. Bitcoin is a new market and does not have price stability. However, Bitcoin's volatility has an upside because it can generate high gains, which is why investors are increasing their exposure with Bitcoin price estimates by industry experts of more than $100,000 within the next 12 months.

Buying cryptocurrencies such as Bitcoin can be a good investment despite frequent price corrections and growing concerns around regulations. Bitcoin's price has historically outperformed traditional assets each year. Furthermore, according to research by Charlie Bilello from the firm Compound Capital Advisors, Bitcoin has produced an average annualized return of 230% which is more than 10 times higher than the second-ranked asset class. Most industry experts anticipate the volatility to reduce as the industry matures, thus reducing the possibility that Bitcoin will ever crash to zero in the future.

How Do You Buy Bitcoins?

Bitcoin can be bought through cryptocurrency exchanges, brokers or directly from other owners of the asset. The most popular method to obtain Bitcoin is using a cryptocurrency exchange. Other ways include Bitcoin ATMs, peer-to-peer owners, CFD, and index funds.

  • Centralized exchanges are the most commonly used way to purchase Bitcoin because users have access to a broader spectrum of cryptocurrencies. However, users must register and complete a KYC to interact with the exchange. Fiat to crypto exchanges such as Coinbase and Crypto.com are regulated exchanges, meaning they operate within the boundaries set by governmental bodies. Additionally, trading platforms like Binance are not fully regulated; however, users can still purchase and trade bitcoin with fiat, stablecoins like GUSD, or other cryptocurrencies.
  • Decentralized exchanges are a new form of financial interaction as they do not rely on intermediaries such as market makers to conduct transactions. Users need to connect with their wallets to access the DEX – decentralized crypto exchange and swap tokens with one another. A DEX takes funds from a liquidity pool to swap tokens with every transaction taking place on the blockchain.
  • Brokers such as eToro and Plus500 allow investors to gain exposure to Bitcoin through financial brokers that offer several financial tools such as futures that are not available in DEXs or restricted in certain jurisdictions on centralized exchanges. Users have to register with a broker beforehand and have sufficient capital because brokers also ask for a management fee for their services.
  • Cryptocurrency ATMs are available where crypto is legal or regulated, allowing users to purchase Bitcoin or other blue-chip cryptocurrencies. Users can buy Bitcoin at the ATM using their credit or debit card and require a Bitcoin wallet address to receive their BTC into their account. However, Bitcoin ATM fees are generally quite high.
  • Peer-to-Peer is a straightforward way for users to purchase Bitcoin by having someone send Bitcoin to their address. This can be done either as a friend or when purchasing a service such as Paxful. Users need to have a Bitcoin address and ask the buyer to send the transaction to their wallet and provide them with the transaction hash to ensure the transaction has been made.'

Ready to invest? Read our guide on how to buy Bitcoin for a step-by-step tutorial on the best way to buy Bitcoin.

Where Do You Store Bitcoins?

Bitcoins are stored in digital wallets. Each wallet is a unique string of 30 letters and numbers that help convey user anonymity and use a seed phrase that helps recover the wallet on any device. There are also two types of Bitcoin wallets: cold and hot wallets.

  • Hot wallets are continuously connected to the internet but don't necessarily have to have the entire block history downloaded to update the token value. Bitpay, TrustWallet, or cryptocurrency exchange's account wallets such as Coinbase are an example of hot wallets. However, hot wallets are less secure because they allow hackers to exploit users' assets. There have been many instances of crypto exchanges being hacked.
  • Cold wallets can store data and assets offline and need to sync to the Bitcoin network to process and update transactions. An example is the Ledger Nano X and Trezor which will cost between USD 60 and USD 150. Cold wallets are physical devices that can be stored and are generally safer than hot wallets because there are lower chances of being hacked. For further information, read our comparison article on the best hardware wallets for Bitcoin.