What is blockchain? It’s a chain of records designed to be unchangeable. Think of it as a notebook where each page references the previous page number—making it extremely difficult to alter pages without everyone noticing.
Here’s how it works: transactions get grouped into “blocks.” Each block contains a batch of transactions plus a unique fingerprint of the previous block. This creates a chain—block 1 connects to block 2, which connects to block 3, and so on.
Why does this matter? Because changing history becomes extremely difficult. If someone tries to alter an old transaction, it would change that block’s fingerprint. But the next block already recorded the old fingerprint. The chain breaks. Everyone sees the tampering immediately.
It’s like a permanent record book where every page is glued to the next one. Remove or change one page, and the whole book falls apart. The tampering becomes obvious.
This is why Bitcoin’s history is trustworthy. Every transaction ever made is recorded in the blockchain, permanently, in order, with each block mathematically linked to the one before it.
So what is blockchain? A chain of transaction records where each link depends on the previous one. Change one link, break the whole chain. History becomes extremely difficult to alter.