Sample Bitcoin Block of Bitcoin Blockchain


This blog represents a sample bitcoin block of a Bitcoin Blockchain. Read greater details from this Oreilly book, Mastering Bitcoin.

sample bitcoin block

Figure 1. Sample bitcoin block

Pay attention to some of the following:

  • Block file format: The block is represented as a file in JSON format
  • Merkle root: Merkle root represents the hash of the root of merkle tree created as a result of combining hash of children nodes. Leaf of the merkle tree represents the hash of the transaction. It takes up 32 bytes of storage. It forms part of Block header.
  • Time: Timestamp when the block is created. It takes up 4 bytes of storage. Forms part of block header.
  • Difficulty: Represents difficult target and takes up 4 bytes of storage. Forms part of block header.
  • Nonce: Counter which helped achieve the difficulty target. Takes up 4 bytes of storage and forms part of block header.
  • Previousblockhash: Represents hash of the previous block. Takes up 32 bytes and forms part of the block header.
  • Height: Height of the block
  • Size: Size of the block
  • Tx: List of hash values of the transactions included in the block.
  • Hash: Block identifier. It is created as a function of block header.



Ajitesh Kumar

Ajitesh Kumar

Ajitesh has been recently working in the area of AI and machine learning. Currently, his research area includes Safe & Quality AI. In addition, he is also passionate about various different technologies including programming languages such as Java/JEE, Javascript and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data etc.

He has also authored the book, Building Web Apps with Spring 5 and Angular.
Ajitesh Kumar

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