Ethereum: What is the magic number used in the block structure? [duplicate]

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I see that you would like to know more about the Ethereum blockchain magic number and what it means. I will give you the details you requested.

What is the magic number used in the Ethereum block structure?

In Ethereum, each block has a unique identifier called a “magic number.” This number is used to distinguish different blocks within the same transaction. It plays a very important role in ensuring that different blocks contain different data.

The magic number for Ethereum is 0xD9B4BEF9. But why does it have this value and what does it mean?

What is the magic number used for?

The magic number is used for several purposes:

• Identification: It helps determine which block contains a specific transaction or data.

• Differentiation

  

  : Different blocks contain different data, which makes it easier to verify transactions and ensure their integrity.

• Organization

  : The magic number helps organize blocks into the blockchain structure.

Why is the magic number always 0xD9B4BEF9?

The meaning of the magic number may seem arbitrary at first glance. However, its significance lies in the way it interacts with other components of the Ethereum block structure.

In Ethereum, each transaction contains a unique identifier (hash) and data. To ensure the integrity and organization of these operations, the magic number is calculated as follows:

blockHash + transactionHash + keccak256 (data)

The keccak256 function is a cryptographic hash function used to create a fixed-length hash from variable-length input (in this case, data). The result of this calculation is a magic number for each block.

What is it used for?

Given its composition and purpose, the Ethereum magic number has several practical applications:

• Transaction confirmation: The magic number ensures that blocks contain valid transactions.

• Blockchain organization: Separating different blocks by their content (magic numbers) helps maintain the integrity of the blockchain.

• Data integrity: The computational process used to create the magic number for each block confirms its authenticity and prevents data corruption.

To summarize, the Ethereum magic number (0xD9B4BEF9) is a key element that allows for the identification, differentiation, organization, and verification of transactions on the blockchain. Its value is the primary identifier of each block, guaranteeing the security and integrity of the Ethereum network.

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