What is cryptocurrency? A beginner's guide

Cryptocurrency is a form of digital money. Unlike naira or dollars, it does not exist as paper bills or coins. It exists as records on a shared digital ledger called a blockchain. When you send Bitcoin to a friend, the blockchain updates to reflect the new ownership.

Cryptocurrencies are issued and managed by software, not by central banks. Bitcoin, the first and most well-known cryptocurrency, was created in 2009. Since then, thousands of other digital assets have launched. Some are competitors to Bitcoin. Others serve very different purposes.

In this guide, we use cryptocurrency and digital assets interchangeably. The financial industry increasingly uses digital assets because it covers a broader category.

A blockchain is a record book that anyone can read but no one can secretly change. Every transaction is grouped into a block. Each block links to the one before it, forming a chain. Once a block is added, altering it would require rewriting every block that came after, on every copy of the ledger worldwide. That makes the record practically tamper-proof.

Blockchains are maintained by networks of computers. No single company runs Bitcoin or Ethereum. Anyone can participate in maintaining the network and verifying transactions. This is what makes cryptocurrency decentralized.

To send or receive cryptocurrency, you need a wallet. A wallet is software, or sometimes a small hardware device, that stores your private keys. Private keys are what prove you own the coins in a particular address. If you lose your private keys, you lose access to your funds permanently.

Bitcoin is the original cryptocurrency. It is often described as digital gold, mostly used as a store of value. Bitcoin has a fixed supply cap of 21 million coins. No new coins will ever be created beyond that limit.

Ethereum is the second largest. It introduced smart contracts, which are programs that run on the blockchain. This made Ethereum the foundation for thousands of apps, including stablecoins, decentralized exchanges, and tokenized assets.

Stablecoins are digital assets pegged to a stable currency, usually the US dollar. USDT and USDC are the most common. Many Nigerians use stablecoins to hold value in dollar terms without opening a US bank account, and to send or receive money across borders cheaply.

Memecoins like Dogecoin and Shiba Inu are highly speculative tokens, often inspired by internet culture. They can rise and fall sharply over short periods. Treat them as entertainment more than investment.

In Nigeria, crypto adoption is driven by several practical needs. First, currency hedging. With the naira losing value to inflation and devaluation, many Nigerians hold a portion of their savings in stablecoins or Bitcoin to preserve purchasing power.

Second, cross-border transactions. Sending and receiving money internationally through traditional banks is slow and expensive. Stablecoins move in minutes for a fraction of the cost. Freelancers, traders, and business owners use crypto to receive payments from foreign clients.

Third, trading. Active traders buy and sell crypto for profit, the same way they would trade stocks. Crypto markets run 24/7, including weekends and holidays. This appeals to people who cannot trade during regular business hours.

Fourth, access to global financial products. Stablecoins can earn yield. Tokenized real-world assets are starting to make traditional investments available to anyone with a wallet, no broker required.