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Understand the Blockchain 101: Hash Verification

By Alexis de Girardier

As described by our amazing Luca two weeks ago, a blockchain is a chain of blocks that contain information. We know that the type of information stored depends on the type of blockchain.

So please, take a sheet of paper or try to visualize a chain of blocks. Now we are going to enter a block to see what is inside.

What is a block? Each block contains three aspects, data, the hash of the block and the hash of the previous block.

We know about the data, it could more or less be anything.A hash could be compared to a fingerprint. It is unique and identifies a block and its content! Once a block is created, its hash is being calculated. If you change something inside the block, it will cause the entire hash to change. This is very important for you to remember! Think about a chain of silver rings, if you modify one single atom of one ring (from silver to gold or gold to silver), your ring won’t have the same characteristics, the same weight or the same composition. A hash is a large number.