Cryptocurrency is digital money that runs on a shared public ledger called a blockchain, secured by cryptography rather than by a bank or government. Nobody controls it centrally, transactions cannot be reversed, and the rules are enforced by software. Bitcoin, launched in January 2009, was the first. More than 20,000 cryptocurrencies now exist, and total market value sat near $3.1 trillion at the end of 2025.
What makes cryptocurrency different from ordinary money
Four properties define it, and the first three are what the word "crypto" is really about, since the fourth follows from them rather than standing on its own.
No central issuer. Dollars are issued by a central bank. Bitcoin is issued by software running on thousands of computers, following rules nobody can change alone.
Verifiable supply. Anyone can check exactly how many units exist. Bitcoin's cap of 21 million is enforced by code, not policy.
Irreversible settlement. Once a transaction confirms, it is final. No chargebacks, no reversals, no authority who can undo it. That is a protection against censorship and a liability when you send to the wrong address.
Pseudonymous. Transactions are tied to addresses rather than names. Public, but not labeled.
How cryptocurrency works
Four pieces. Working together.
The blockchain is a public record of every transaction, grouped into blocks and chained so that altering an old entry would require redoing everything after it.
Consensus is how thousands of independent computers agree on which transactions are valid. Bitcoin uses Proof of Work, where miners compete to add blocks. Ethereum uses Proof of Stake, where validators lock collateral.
Keys control ownership. A private key authorises spending. Whoever holds it controls the funds, which is why losing it means losing everything.
Wallets hold keys and generate addresses. They do not hold coins. The coins live on the blockchain; the wallet holds the ability to move them.
The main types of cryptocurrency
| Type | Purpose | Examples |
|---|---|---|
| Payment and store of value | Move or hold value without an intermediary | Bitcoin, Litecoin |
| Smart contract platforms | Run programs and applications | Ethereum, Solana, Avalanche |
| Stablecoins | Hold a steady value, usually one dollar | USDT, USDC |
| Utility tokens | Unlock features inside a specific platform | $MBG on mb.io |
| Governance tokens | Vote on how a protocol is run | UNI, AAVE |
| Memecoins | Community and culture rather than technical function | Dogecoin, Shiba Inu |
Note that these categories differ enormously in risk. Bitcoin and a memecoin launched last week are both cryptocurrencies in the same way a government bond and a lottery ticket are both financial instruments.
What cryptocurrency is used for
- Storing value outside the banking system, which is the largest use by capital.
- Cross-border transfers settling in minutes without correspondent banks.
- Trading, both as an asset class and as the base currency for other crypto assets.
- Running applications through smart contracts: decentralized exchanges, lending, tokenized assets.
- Payments, particularly stablecoin payments, which processed roughly $9 trillion in adjusted transfer volume over a trailing year according to a16z.
- A hedge in countries where the local currency is failing.
The risks of cryptocurrency
- Volatility. Bitcoin has fallen more than 77% from a peak on four separate occasions. Smaller assets move far more.
- Irreversibility. Send to the wrong address and it is gone. No recourse exists at the protocol level.
- Custody. Lose your private key and the funds are permanently inaccessible. Hold on an exchange, and you depend on that exchange's solvency.
- Scams. Binance Research found roughly 97% of memecoins have died or collapsed. Phishing, rug pulls, and pump and dumps are endemic.
- Regulation. Frameworks differ by country and continue to change. What is permitted in one jurisdiction may not be in another.
- Technical failure. Smart contracts have bugs. DefiLlama's hack tracker records $7.6 billion in cumulative DeFi losses.
The crypto regulatory picture in 2026
Three developments define it.
In the US, the March 2026 joint SEC-CFTC interpretation classified 16 major assets, including Bitcoin and Ethereum, as digital commodities rather than securities. The GENIUS Act regulates stablecoins from January 2027. The CLARITY Act, which would write market structure into law, faced its first Senate floor vote in September 2026.
In the EU, MiCA provides a single passportable license across 27 member states.
In Dubai, VARA operates as a dedicated virtual asset regulator, the first standalone one in the world.
Where mb.io fits
Understanding what cryptocurrency is comes first. Getting regulated access to it comes second, and the venue you choose determines most of the risks you can control.
mb.io is a regulated crypto spot exchange backed by MultiBank Group, a financial institution founded in 2005 that serves more than 2 million clients across 100+ countries.
- Regulated by VARA in the UAE and AUSTRAC in Australia
- 10/10 security score from Hacken, an independent blockchain security auditor
- Institutional-grade MPC custody powered by Fireblocks, with segregated client funds
- A curated list of assets, so you're not sorting through thousands of tokens to find the ones worth trading
- Buy, sell, and swap in three steps, from sign-up to purchase
- 24/7 multilingual client support
Open your account and start trading on mb.io.
Frequently asked questions
What is cryptocurrency in simple terms?
Digital money that runs on a shared public ledger secured by cryptography, with no central issuer. Rules are enforced by software running on thousands of computers rather than by a bank or government.
How many cryptocurrencies are there?
More than 20,000 are tracked across major listing sites, though only a small fraction have meaningful trading volume or active development. Total market value sat near $3.1 trillion at the end of 2025.
What was the first cryptocurrency?
Bitcoin, launched on 3 January 2009 by a pseudonymous creator known as Satoshi Nakamoto. Every cryptocurrency since is defined in relation to it.
Is cryptocurrency legal?
In most countries, yes, under frameworks that vary widely. The US, EU, and UAE all have regulatory regimes. A few countries restrict or prohibit it. Check the position in your jurisdiction.
Is cryptocurrency anonymous?
Pseudonymous. Transactions are tied to addresses rather than names and are permanently public. Analytics firms routinely link addresses to identities through exchange records and transaction patterns.
How do I buy cryptocurrency?
Through a regulated exchange, which converts fiat currency into crypto after identity verification. Licensed platforms require KYC in every major jurisdiction.
Can cryptocurrency be hacked?
The core ledger of a major blockchain has never been rewritten. Almost every theft has targeted what sits on top: exchanges, bridges, wallets, and smart contracts.
What is the difference between a coin and a token in crypto?
A coin is the native asset of its own blockchain, like Bitcoin or ETH. A token is built on top of an existing blockchain, like USDT or $MBG on Ethereum-compatible networks. The terms get used loosely.
