Blockchain
A blockchain is a decentralized digital ledger that records transactions in blocks, links those blocks together, and makes the record difficult to alter.
✦ Key Insight
Blockchain technology is the foundation of cryptocurrency. It allows value to be transferred, verified, and stored without relying on a single central authority. For traders, understanding blockchain helps explain transaction speed, fees, network congestion, token standards, and why coins and tokens work differently across ecosystems.
✕ Common Misconceptions
A common mistake is using “blockchain” and “crypto” as if they mean the same thing. Another is assuming all blockchains are equally fast, cheap, or secure. Beginners also sometimes ignore that different chains support different wallets, tokens, and applications.
Detailed Explanation
How It Works
Transactions are grouped into blocks. These blocks are validated by the network and added to a chain of previous blocks. Because many participants help maintain the ledger, the system is decentralized. Different blockchains use different consensus methods, such as proof of work or proof of stake.
FAQs
Is blockchain only used for crypto?
No. It can also be used for records, identity systems, and other applications.
Can blockchain data be changed?
It is designed to be very difficult to alter once confirmed.
Why are there many blockchains?
Because each network makes different trade-offs around speed, security, cost, and design.
In Practice
Dig Deeper
Staking
The process of actively participating in transaction validation on a Proof-of-Stake (PoS) blockchain. Participants lock up (or 'stake') their cryptocurrency holdings to support network security and operations, earning rewards in return, similar to earning interest.
Smart Contract
A smart contract is self-executing code stored on a blockchain that automatically performs actions when certain conditions are met.
Token
A token is a digital asset built on top of an existing blockchain rather than having its own independent blockchain.