bloque

Imagine you have a hundred-page digital document and need to check that no one has changed a single word since it was created.
You could read it again, compare it line by line with the original, and look for differences. But what if you had to verify millions of documents?
There is a cryptographic tool that lets us perform this check much more efficiently: the HASH.
A hash is the result of applying a mathematical function to specific information. That information can be a word, a photograph, a document, a transaction, or any set of digital data.

The genesis block was the starting point. Then came block 1, followed by block 2, block 3, and all the blocks that came afterward.
But what matters is not simply that consecutive blocks exist, but the relationship they have with one another...
In Bitcoin, every block after the genesis block contains a cryptographic reference to the previous block in its header.
This allows us to establish a precise connection between them.
We can represent it simply:
BLOCK 0 → BLOCK 1 → BLOCK 2 → BLOCK 3