In blockchain and Ethereum every block is related to another block. There is a parent-child relationship between two blocks. There can be only one child to a parent and a child can have a single parent. This helps in forming a chain in blockchain. Blocks are explained in a later section in this chapter. In the following diagram, three blocks are shown—Block 1, Block 2, and Block 3. Block 1 is the parent of Block 2 and Block 2 is the parent of Block 3. The relationship is established by storing the parent block's hash in a child's block header. Block 2 stores the hash of Block 1 in its header and Block 3 stored the hash of Block 2 in its header. So, the question arises—who is the parent of the first block? ...
How are blocks related to each other?
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