What Is a Blockchain?
📖 5 min read
Quick Answer
A blockchain is a list of records that is copied across many computers and locked together so tightly that changing one old entry would break everything after it. That is what makes it trustworthy without a trusted middleman.
💡 Think of it as…
A stack of pages where each new page is stamped with a tamper-proof seal that also contains a tiny fingerprint of the previous page. Tear out or edit any page and every seal above it stops matching — instantly exposing the fraud to everyone holding a copy.
Blocks
A block is just a batch of transactions plus some metadata. Bitcoin adds a new block roughly every 10 minutes. Each block has a maximum size, so transactions compete for space by paying fees.
The chain (hashes)
Every block stores the hash — a unique digital fingerprint — of the block before it. This links blocks into a chain in a fixed order. Because each fingerprint depends on the previous one, the blocks are mathematically welded together.
Why it is tamper-evident
Change a single transaction in an old block and its fingerprint changes, which breaks the next block, and the next, all the way to the top. To get away with it you would have to redo all that proof-of-work faster than the entire network — practically impossible.
🔑 Key takeaway
A blockchain is an append-only, fingerprint-linked record copied across many computers. You can add to it, but you cannot quietly rewrite it.
Why this matters for you
This is the foundation under every exchange, wallet and stablecoin you use across Asia. Knowing how it works helps you judge which projects are genuinely decentralized and which just borrow the buzzword.
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Is blockchain the same as Bitcoin?▼
No. Blockchain is the underlying record-keeping technology; Bitcoin is the first and largest network that uses it. Many other projects use blockchains too — see Bitcoin vs blockchain.
Can a blockchain be hacked?▼
Rewriting Bitcoin’s blockchain would require out-computing the entire global network (a "51% attack"), which is astronomically expensive. Most "crypto hacks" are actually exchanges or wallets being breached, not the blockchain itself.
Is the blockchain public?▼
Bitcoin’s blockchain is fully public — anyone can inspect every transaction. Identities are not attached directly, but addresses can sometimes be linked to people, so it is pseudonymous, not anonymous.