what transpired. So, we do what any good detective would such a situation – witnesses to the event and ask them what they observed. Imagine – we query ten witnesses about the robbery. Eight out ten witnesses us one version of the event – that four robbers ran out of the bank, jumped into a red sedan, and drove away from the bank heading north. Two of our ten witnesses tell different story – that two robbers ran out of the bank, got into a white , and drove far awaythe bank heading south. Which version truth? As detectives, we’re likely to believe the version of the story told by the
majority of the participants. provide a suspect description we’ll describe four
robbers red sedan head-in. This same principle extensively blockchain – assumed to be majority of participants agree.
How are Blocks “Chained” Together?
To link our sheets together we embed information from the previous sheet of paper into the new, recently validated sheet. In Blockchain, our sheet of paper is a block. The act of embedding a previous block into block chaining. Hence, the name Blockchain.
To chain blocks together today, all data block is run through a special function called a
“cryptographic hash”. Cryptographic hashes create output or identifier for specific input.
Therefore, the hash block will always be unique based upon the inputs, and attempting the data block will a hash or ID that matches value recorded on the next block To link or chain blocks together the header of block contains the hash of the last (validated) block. Changing on any block Blockchain will different hash and the new hash match the hash next block header thus breaking the Blockchain and invalidating all blocks linked to where the change was made. Blockchain its property of immutability (can’t be changed) and makes it highly censorship-resistant. of a block simply refers to of blocks on the chain after the one in question. Block height is an indicator of of on the block; changing data in any block requires an attacker every subsequent block. The more blocks an attacker must alter, the more
difficult it becomes off an attack.