What is a blockchain? Explained without jargon
A blockchain is a shared record book. Instead of one company keeping the records, thousands of computers each keep a copy and agree together on every new entry.
Blocks and chains
New records (for example, payments) are grouped into a block. Each block contains a fingerprint (a hash) of the block before it. Change anything in an old block and its fingerprint changes, breaking the chain. That is why history on a blockchain is so hard to rewrite.
Who adds the blocks?
Different blockchains use different methods:
- Proof of work (Bitcoin): miners compete to solve a hard puzzle; the winner adds the next block.
- Proof of stake (Ethereum and many others): validators lock up coins as a guarantee of good behaviour and take turns adding blocks.
Why it matters
- No single point of control: no one can freeze or edit the shared record on their own.
- Transparency: anyone can check payments on a public blockchain explorer.
- Programmable money: some blockchains run small programs (smart contracts) that move money automatically when conditions are met.
Beyond money
Blockchains are also used for digital ownership records, supply-chain tracking and games. But payments and trading remain the biggest use today.
Explore the coins built on different blockchains on the Velxen markets page.
This article is for education only and is not financial advice. Crypto prices can rise and fall sharply; only trade with money you can afford to lose.
