Cryptocurrency
In simple terms
Digital money that exists only online and is kept safe using special math codes instead of a bank. Think of it like electronic cash that you can send directly to someone without needing a middleman to verify it.
Definition
A digital currency secured by cryptography and typically decentralized.
In depth
A digital asset secured through cryptographic algorithms and typically operated on a decentralized network of nodes rather than a central authority. Transactions are validated through consensus mechanisms (such as Proof of Work or Proof of Stake), where network participants verify and record transactions in a distributed ledger, usually a blockchain. Cryptographic hashing ensures transaction integrity and immutability, while the decentralized architecture eliminates the need for intermediaries like banks to maintain the ledger.
How does Cryptocurrency work?
A cryptocurrency is balances recorded on a shared ledger, controlled by cryptographic keys. A wallet generates a private key and derives a public address from it. To send funds, the wallet builds a transaction and signs it with the private key; the signature proves control without revealing the key. The signed transaction is broadcast to a network of nodes, which check the signature and that the balance has not already been spent. Validators or miners bundle valid transactions into a block, and once the network agrees on that block the ledger updates for everyone. Confirmed transfers cannot be undone.
An example
Illustrative scenario. Someone in the United States sends the equivalent of $200 in a cryptocurrency to a relative abroad. They paste the recipient's address, confirm in the wallet, and a network fee — say $1.50 — is deducted. The transaction is signed and broadcast, shows as pending within seconds, and is treated as settled after a set number of confirmations. The recipient sees the balance with no bank in between. A mistyped address is generally not recoverable.
Figures are illustrative only.
What beginners get wrong
- Sending a token over the wrong network is a common and usually permanent loss, because the address format can look valid on several chains.
- Whoever holds the private key controls the funds, so a seed phrase photographed, emailed, or saved in cloud notes is effectively shared.
- Confirmed transactions are final: there is no chargeback, and no support team can reverse a transfer sent to the wrong address.
- Prices of most cryptocurrencies move sharply in both directions, and a complete loss of value is possible.
Related terms
Part of
What is cryptocurrency, and how does it work? — the subject page for cryptocurrency basics, with all 23 of its definitions in one place.
Educational only — not financial advice.