Mastering Blockchain - Second Edition

Blocks and blockchain

As discussed earlier in this chapter, blocks are the main building blocks of a blockchain. Ethereum blocks consist of various elements, which are described as follows:

• The block header
• The transactions list
• The list of headers of ommers or uncles

The transaction list is simply a list of all transactions included in the block. Also, the list of headers of uncles is also included in the block.

The most important and complex part of a block in Ethereum is the block header. Block header consists of various elements which are introduced here.

Block header: Block headers are the most critical and detailed components of an Ethereum block. The header contains valuable information, which is described in detail here:

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