What is cryptocurrency?

Cryptocurrency is a general term for digital units of value that use cryptography to verify transactions and demonstrate authority over assets. Examples such as bitcoin and ether are the native assets of networks operating under different rules. Products commonly called cryptocurrencies do not all have the same characteristics: some are designed for payments, while some tokens relate to application use, governance or other rights. The broader term “crypto-asset” covers this diversity. Owning a crypto-asset does not provide guaranteed returns, government backing or legal tender status in every country.

How does cryptocurrency work? Blockchains, coins, tokens and wallets

1. Digital money and cryptocurrency A bank account balance is also digital, but generally depends on records maintained by a bank and a claim against that bank. Crypto-asset records depend on the model of the network and issuer. Not all digital money is cryptocurrency; a central bank digital currency does not have the same structure as Bitcoin simply because it is digital. 2. What is a blockchain? A blockchain is a distributed ledger in which transaction records are grouped into cryptographically linked blocks. Many participants check the consistency of records using the same rules. Altering history is made difficult; the degree of difficulty depends on the network's security model. Recording something on a blockchain does not by itself prove that the information is true in the real world or that the project is trustworthy. 3. What does decentralization mean? The goal is to prevent one party from easily controlling records or rules. However, validator distribution, software development, token ownership and administrator keys can be concentrated to different degrees. A decentralized network does not mean that every exchange, wallet service or token on it is decentralized. 4. Are Bitcoin and Ethereum the same? Bitcoin is a payment and value-transfer network with a native asset called BTC. Ethereum is a platform that runs smart contracts and has a native asset called ether, whose symbol is ETH. They are different networks. Appearing in the same wallet application does not mean that assets are on the same network or can be sent interchangeably. 5. Coins and tokens A coin usually means a network's native asset, whereas a token means an asset defined on an existing network. Ethereum's ERC-20 standard enables applications to interact consistently with fungible tokens. A token's name or symbol is not unique; the correct network and contract address must be verified together. A counterfeit token can use the same name. 6. What is a smart contract? A smart contract is a program operating on a network according to specified conditions. It can automate transfers, swaps or collateral management. Code errors, external data sources and administrator privileges create additional risks. “Smart” does not guarantee perfection or a legally enforceable agreement; verified source code is not the same as audited code. 7. How does a transaction happen? The user chooses a destination address and amount, the wallet signs the transaction request with an authorized key, and the request is sent to the network. A transaction complying with network rules is verified and recorded. Its status can be checked in a block explorer using its transaction identifier. Pending, failed and confirmed are different states; finality conditions and waiting times vary between networks. 8. Transaction fees and gas Fees pay for network resources and are calculated according to network rules. On Ethereum, gas measures the cost of computation and storage operations. Sending a token may require the network's native asset separately for fees. An exchange's withdrawal fee can differ from the blockchain transaction fee. A failed contract transaction can still incur fees for resources used. 9. What does a wallet actually store? A wallet is a tool for viewing balances and authorizing transactions; assets are represented by network records rather than stored inside a device like physical files. An address can generally be shared; private keys and recovery phrases are secret. Someone who obtains a recovery phrase can control assets in many wallets. A wallet password and a recovery phrase are different things. 10. Hot, cold and custodial wallets Internet-connected use is called a hot wallet, while arrangements keeping keys offline are called cold storage. In a custodial service, the provider manages the keys; with self-custody, the user is responsible. A hardware wallet can reduce some risks but does not automatically make an incorrect address or malicious signature safe. A central password reset is not always possible for a lost key. 11. Mining and staking In proof of work, miners perform computation to participate in block production; Bitcoin uses this approach. In proof of stake, validators help secure the network by putting assets at stake. Staking can involve penalties, lock-up periods, provider risk and price risk. Not every product a platform calls “staking” participates directly in network validation; some involve lending or other strategies. 12. What is a stablecoin? A stablecoin aims to maintain a value close to a reference such as the US dollar. Reserves, crypto collateral or other mechanisms may be used. Price stability is not guaranteed; inadequate reserves, redemption restrictions, issuer risk and a loss of the peg can occur. Some issuers have freezing or blocking powers. A stablecoin is not automatically an insured bank deposit.

Uses, market concepts, risks and frequently asked questions

13. Where are crypto-assets used? Examples include person-to-person value transfers, application fees, digital goods and some governance processes. Their usefulness depends on fees, transaction speed, access and acceptance by the other party. Not every task needs a blockchain. A useful application does not mean that its token must rise in price. 14. Centralized exchanges and decentralized swaps On a centralized exchange, the user trusts a service's account and custody systems. Decentralized swaps generally operate through wallets and smart contracts. Provider insolvency or suspended withdrawals can be prominent risks in the former; contract, malicious-token and liquidity risks can be prominent in the latter. A decentralized label does not prove that the interface or administration is entirely beyond centralized control. 15. DeFi, liquidity pools and yield DeFi is a general term for financial applications such as swaps, borrowing and collateral management. A liquidity pool can be a contract structure that brings assets together for transactions. Price movements can leave a liquidity provider worse off than simply holding the assets. A displayed annual yield is not a fixed return; reward-token value and conditions can change. 16. Price, market capitalization and liquidity Price forms through supply and demand in the markets where trading occurs. Market capitalization generally means unit price multiplied by circulating supply; it does not mean the total cash invested or that all assets can be sold at that price. In low liquidity, even small orders can move the price. Slippage between the displayed and execution prices can increase total cost. 17. Total supply, circulation and administrator powers Circulating supply, total supply and any maximum supply are different measures. Future unlocks or new issuance can affect supply. A contract's powers to mint tokens, upgrade, pause transfers or block addresses should be examined. Fixed supply and a design without administrators can reduce some intervention risks; they do not guarantee price, liquidity or project honesty. 18. Layer 2 networks and bridges Layer 2 networks aim to increase capacity and reduce cost by processing some transactions outside the main network. Bridges transfer value between networks; mechanisms, verification and waiting times differ. Networks using the same address format are not identical. Bridge failures or security breaches can cause losses even while the main network is operating. 19. Is cryptocurrency anonymous? Addresses and transactions are visible on many public blockchains. The absence of a person's name on an address does not provide complete anonymity; exchange records and chain analysis can connect identities. Keeping a private key secret does not mean that the transaction history is also secret. Privacy features vary between networks. 20. Main loss and fraud risks Price declines, low liquidity, leveraged liquidations, platform collapse, software vulnerabilities and lost keys can cause losses. Guaranteed returns, fake support staff, lookalike addresses and demands for additional money to unlock withdrawals are common warning signs. Unknown token approvals or signatures that are not understood can authorize asset transfers. Audit reports and well-known names do not eliminate risk. 21. Basic security Verifying application and website addresses through official sources, using unique passwords and appropriate multifactor authentication are basic steps. Recovery phrases should not be shared with support staff or entered into random forms. Before sending, check the network, destination address, token contract and any memo or tag. A small test transfer can reduce error risk; the security and accessibility of backups also need planning. 22. Frequently asked questions “Is every cryptocurrency Bitcoin?” No; networks, supply and powers differ. “Must I buy a whole coin?” Many assets can be divided into small units. “Can an incorrect transfer be cancelled?” There is no general central cancellation mechanism for finalized transactions; recoverability depends on the network and recipient. “Does creating a token give it value?” No; technical creation does not create demand or liquidity. “Are stablecoins risk-free?” No. “Does owning crypto make me a company shareholder?” Without explicitly defined rights, it does not automatically provide share ownership. 23. Legal status and environmental impact Rules governing transactions, payments, custody and taxation vary by country, activity and date; current official sources must be checked separately. Consumer protection is not identical across crypto-asset services. Environmental impact depends on the consensus method, energy source and hardware; evaluating all networks' energy consumption using a single example is inappropriate. This article provides general information, not investment, legal or tax advice. Sources were checked on 19 October 2026.