Blockchain

Blockchain is a public ledger of a timestamped, ordered, and immutable list of all transactions on the Bitcoin network. Each block is identified by a hash in the chain and is linked to its previous block by referencing the previous block's hash.

In the following table structure of a block is presented, followed by a detailed diagram that provides a detailed view of the blockchain structure.

The structure of a block

The following table shows the structure of a block:

Field	Size	Description
Block size	4 bytes	This is the size of the block.
Block header	80 bytes	This includes fields from the block header described in the next section.
Transaction counter	Variable	This field contains...