BlockchainBeginner

What is a cryptocurrency blockchain?

A cryptocurrency blockchain is a shared ledger that records transactions without a central authority. Bitcoin, created in 2009, was the first to use one.

Vahe HakobyanEditor-in-chief Updated Oct 6, 20263 min readFact-checked

Illustration: World-Crypt

On this page

What problem does it solve?How does a blockchain work?How do people use crypto blockchains?What are the risks and limits?Blockchain vs cryptocurrency: what's the difference?FAQ

Short answer

A cryptocurrency blockchain is a shared digital ledger that records crypto transactions. It lets strangers agree on one record without a central authority.

The first decentralized blockchain was created in 2008 by a person or group using the name Satoshi Nakamoto. Bitcoin followed in January 2009.

What problem does it solve?

Blockchain at a glance

Created by: Satoshi Nakamoto
First blockchain: 2008
Bitcoin launched: January 2009
What it is: Ledger spread across many computers
Consensus: Proof of work and proof of stake

A blockchain is a shared digital ledger that records crypto transactions. It gives participants the same record and rules, so strangers can agree on ownership without a central authority.

How does a blockchain work?

Transactions are grouped into blocks and confirmed by consensus rules. Each block holds data, a timestamp, and a secure link to the previous block, and nodes follow the same rules to validate new blocks.

New transactions wait for inclusion.
Nodes check the rules.
A block is proposed.
The network confirms it.
The block links to the last one.

How do people use crypto blockchains?

People use wallets to send, receive, and check crypto on a blockchain. The wallet holds the keys that approve a transfer, while the blockchain holds the record.

Wallet actions and the blockchain
What you do	What the blockchain does
Send crypto	Records the transfer after confirmation
Receive crypto	Adds the incoming transfer to the ledger

What are the risks and limits?

Crypto sends are usually irreversible once a network confirms them. A lost private key can mean lost access, and public blockchains record transactions openly, so activity can be traceable.

Irreversible sends: a confirmed transfer cannot be called back.
Lost keys: without the private key, you lose access.
Public records: transaction history is open to view.
Forks and upgrades: rules can change, so records are not unalterable.

Blockchain vs cryptocurrency: what's the difference?

The blockchain is the network and shared record; cryptocurrency is the asset it tracks. Bitcoin is a cryptocurrency, and the Bitcoin blockchain records its transactions.

Blockchain compared with cryptocurrency
Blockchain	Cryptocurrency
Shared ledger and network	Digital asset tracked on it
Records transactions	Moves between wallets

Frequently asked questions

No. Bitcoin is one cryptocurrency built on a blockchain. The blockchain is the shared ledger and network that records bitcoin transactions.

A large public blockchain is hard to attack because many computers hold copies. It can still change through forks and upgrades, so records are not unalterable.

No. Some blockchains record other data without a coin. Many public networks use a native cryptocurrency to pay fees.

No. Some are private or run by a limited group. Public blockchains show transactions openly and are not fully anonymous, so activity can be traced.

Was this guide helpful?

Written byVahe HakobyanVahe Hakobyan is the editor-in-chief of World-Crypt. He covers bitcoin, markets and regulation, and leads the newsroom that fact-checks every story before it goes live.