Here’s what a block looks like conceptually.
It has four main components: the Block Header, Block Size, Transaction Counter, and Transactions.
The “Block Size” field tells how large the block is.
The “Block Header” field represents the metadata necessary for understanding the components of the block.
The “Transaction Counter” field says how many transactions are within the block.
The “Transactions” field is the actual transaction data.
For this lecture, we’re going to focus first on the composition of a block header, the information that enforces the security of the blockchain.
