The word blockchain, originally called block chain, is derived from the link between blocks. Because the hash of one block is based on the hash of the previous block, it is like a chain linking all the way back to the first, or genesis, block. This process confirms the integrity of the previous blocks in the chain. The following diagram shows how blocks are linked together using the previous block hash:
Every block is linked to its previous block through the block hash. The generated hash of a new block uses the hash of the previous block
Because the hash of each new block is based on the hash of the previous block, manipulation ...
