Figure 1.7: Merkle root

As the name suggests, a Blockchain is a chain of blocks, where

each block points to a previous block. As shown in Figure 1.8, each

block has a block Header that in turn consists of the Merkle root, the

hash of the last block, and a nonce. If any of the data changes, then

the Merkle root of the block would alter and that would not match

with the hash in the next block which is stored as the “Hash of

previous block”. Refer to Figure 1.8, as follows: