What Are Cryptocurrencies and How Do They Work?

What is a cryptocurrency?

A cryptocurrency is a digital currency that uses cryptography to secure transactions and verify transfers without relying on a central authority such as a bank or government. The word "cryptocurrency" combines "crypto," referring to the cryptographic techniques that protect transaction data, and "currency," reflecting its function as a medium of exchange.

Unlike traditional currencies issued by central banks (known as fiat currencies), cryptocurrencies are not controlled by any single institution. Bitcoin, launched in 2009, was the first cryptocurrency. Since then, thousands of cryptocurrencies have entered the market, each with different underlying technology, governance structures, and intended use cases.

How does a cryptocurrency work?

A cryptocurrency works by recording transactions on a blockchain, a shared digital ledger distributed across a network of computers. When one party sends cryptocurrency to another, the transaction is broadcast to the network, where participants (called nodes) validate it using cryptographic techniques. Once verified, the transaction is grouped with others into a block and added permanently to the chain.

This process removes the need for an intermediary such as a bank. The sender and receiver transact directly through the network, and the blockchain provides a tamper-resistant record that every participant can audit independently.

Two elements keep the network secure: cryptography and consensus mechanisms.

• Cryptography protects transaction data by converting it into encrypted code that only authorised parties can read.

• A consensus mechanism is the set of rules the network follows to agree that a transaction is valid before recording it. Different cryptocurrencies use different consensus mechanisms, but all serve the same purpose: preventing fraud and double-spending without a central authority.

How is cryptocurrency created?

Cryptocurrency is created through 3 primary methods: mining, staking, and hard forks.

1. Mining

2. Staking

3. Hard forks

Mining is the process of using computing power to solve complex mathematical problems that validate transactions on the network. The first computer to solve the problem earns the right to add a new block to the blockchain and receives newly created cryptocurrency as a reward. Bitcoin is the most well-known mined cryptocurrency.

Staking requires participants to lock up an amount of existing cryptocurrency as collateral to validate transactions. The network selects validators based on the size and duration of their stake, and rewards them with newly created tokens for processing blocks correctly. Ethereum uses this method.

Hard forks occur when developers modify the rules of an existing blockchain to create a separate network. The new network operates independently from that point forward and issues its own cryptocurrency. Bitcoin Cash, for example, was created through a hard fork of Bitcoin in 2017.

Regardless of the creation method, all new cryptocurrency units are recorded and stored on the blockchain from the moment they are generated.

Where do cryptocurrencies get their value?

Cryptocurrencies get their value from supply and demand. When more people want to buy a cryptocurrency than sell it, the price rises. When selling pressure exceeds buying interest, the price falls.

Several factors influence this supply-demand balance: the total and circulating supply of tokens, the utility the network provides, adoption by users and institutions, developer activity, and broader market sentiment. Bitcoin's fixed supply cap of 21 million coins, for example, creates scarcity that supports demand as adoption grows.

The total value of a cryptocurrency in circulation is measured by its market capitalisation, calculated by multiplying the current price by the number of tokens in circulation. Market capitalisation is the most widely used metric for comparing the relative size of different cryptocurrencies.

What are the advantages of cryptocurrencies?

Cryptocurrencies offer 4 core advantages: decentralisation, enhanced security, global accessibility, and transparency.

1. Decentralisation. Cryptocurrencies operate across distributed networks rather than through a single institution. No bank, government, or company controls the currency or can unilaterally freeze accounts, reverse transactions, or alter supply rules.

2. Enhanced security. Cryptographic encryption protects every transaction on the network. Once a transaction is validated and recorded on the blockchain, it cannot be altered or deleted, making the ledger resistant to fraud and tampering.

3. Global accessibility. Anyone with an internet connection can send and receive cryptocurrency, regardless of location or banking status. Transactions settle directly between parties without the delays, fees, or restrictions associated with international bank transfers.

4. Transparency. Every transaction is recorded on a public blockchain that any participant can view and verify in real time. This open record creates a permanent audit trail that holds all network activity accountable.

What are the drawbacks of cryptocurrencies?

Cryptocurrencies have 6 main drawbacks: price volatility, limited legal protection, security risks, scalability constraints, high network fees, and limited acceptance.

1. Price volatility. Cryptocurrency prices can move sharply in short periods. Bitcoin, for example, has experienced single-day price swings exceeding 10%, which creates significant risk for anyone holding or transacting in crypto.

2. Limited legal protection. Cryptocurrency payments are not covered by the same consumer protections that apply to bank deposits or card transactions. Crypto is not regulated like stocks or insured like fiat currency held in a bank account, so recovering lost or stolen funds is difficult.

3. Security risks. The technology itself is cryptographically secure, but the platforms and tools built around it are not immune to hacks, bugs, and scams. Exchange breaches, phishing attacks, and fraudulent projects have resulted in billions of dollars in losses across the industry.

4. Scalability constraints. Major blockchain networks face limits on how many transactions they can process per second. During periods of high demand, this creates bottlenecks that slow confirmation times and push costs higher.

5. High network fees. Some blockchains charge significant transaction fees, particularly during congestion. Ethereum gas fees have historically spiked to levels that make small transactions uneconomical.

6. Limited acceptance. Cryptocurrencies are not widely accepted as a payment method. The majority of merchants, service providers, and institutions still operate exclusively in fiat currency, which restricts the everyday utility of crypto.

How are cryptocurrencies used?

Cryptocurrencies are used in 5 primary ways: direct payments, online transactions, trading, remittances, and as a store of value.

1. Direct payments. Cryptocurrencies allow two parties to send and receive funds without an intermediary. The sender transfers crypto directly to the receiver's wallet address, and the blockchain settles the transaction without involving a bank or payment processor.

2. Online transactions. A growing number of online merchants and service providers accept cryptocurrency as payment. Buyers pay by sending crypto to the merchant's wallet, and the transaction settles on the network without a credit card or third-party gateway.

3. Trading. Cryptocurrency trading involves speculating on the price movements of crypto assets such as Bitcoin and Ethereum. Traders open and close positions through a broker or exchange, aiming to profit from rising or falling prices without necessarily owning the underlying asset.

4. Remittances. Cryptocurrencies provide an alternative channel for cross-border money transfers. Sending crypto internationally avoids the routing fees, currency conversion charges, and multi-day settlement times associated with traditional wire transfers.

5. Store of value. Some investors hold cryptocurrencies as a long-term asset, treating them similarly to gold or other commodities. Bitcoin is the most common example, with its fixed supply cap of 21 million coins frequently cited as a hedge against fiat currency inflation.

How many types of cryptocurrencies are there?

There are thousands of cryptocurrencies in circulation, but most fall into 5 main types: currency coins, smart contract tokens, stablecoins, utility tokens, and memecoins.

1. Currency coins. Currency coins function as digital money designed for sending and receiving payments. They prioritise fast, low-cost transactions across the network. Examples include Bitcoin (BTC) and Litecoin (LTC).

2. Smart contract tokens. Smart contract tokens power blockchain platforms that execute programmable, self-enforcing agreements called smart contracts. These platforms support decentralised applications ranging from lending protocols to digital marketplaces. Examples include Ethereum (ETH) and Solana (SOL).

3. Stablecoins. Stablecoins are pegged to an external asset, typically a fiat currency like the US dollar, to maintain a stable price. They are commonly used for transferring value between exchanges and settling transactions without exposure to price volatility. Examples include Tether (USDT) and USD Coin (USDC).

4. Utility tokens. Utility tokens grant holders access to a specific product or service within a blockchain ecosystem. Their value is tied to the demand for the platform they serve rather than to general market speculation. Examples include Chainlink (LINK) and Filecoin (FIL).

5. Memecoins. Memecoins originate from internet culture and online communities rather than a defined technical purpose. Their prices are driven primarily by social sentiment and speculative demand. Examples include Dogecoin (DOGE) and Shiba Inu (SHIB).

How can I make money through cryptocurrencies?

You can make money through cryptocurrencies in 7 ways: buying and holding, trading, staking, lending, mining, yield farming, and airdrops.

1. Buying and holding. Buying and holding involves purchasing cryptocurrency and storing it in a wallet, profiting when the asset's price rises above your purchase price.

2. Trading. Trading involves opening and closing positions on crypto price movements over short timeframes, profiting from the difference between entry and exit prices.

3. Staking. Staking involves locking cryptocurrency in a blockchain network to help validate transactions in return for newly created tokens as rewards.

4. Lending. Lending involves supplying cryptocurrency to borrowers through a platform and earning interest on the loan.

5. Mining. Mining uses computing power to validate transactions and add new blocks to a blockchain in return for newly created cryptocurrency as a reward.

6. Yield farming. Yield farming involves depositing cryptocurrency into decentralised finance (DeFi) protocols to earn rewards from trading fees, interest, or token incentives.

7. Airdrops. Airdrops are free token distributions from blockchain projects, typically awarded as a reward for early adoption or network participation.

How do I start trading cryptocurrencies?

You can start trading cryptocurrencies in 4 steps:

What is a cryptocurrency exchange?

A cryptocurrency exchange is an online platform where users buy, sell, and trade digital assets. The exchange matches buyers and sellers, executes orders, and provides the infrastructure for transferring cryptocurrency between accounts. Cryptocurrency exchanges fall into 2 categories: centralised and decentralised.

Centralised exchanges (CEXs) are operated by a company that manages the platform, holds user funds, and processes transactions. Binance and Coinbase are two of the largest centralised exchanges by trading volume.

Decentralised exchanges (DEXs) operate without a central company. Trades execute directly between users through smart contracts on a blockchain, and each party retains control of their own funds throughout the transaction. Uniswap and SushiSwap are two widely used decentralised exchanges.