Data Structure of Bitcoin Block

This section describes the Data Structure of a Bitcoin Block.

The data structure of a Bitcoin block is described in the following table:

Field        Size         Description

Magic #      4 bytes      Fixed value of 0xD9B4BEF9
Blocksize    4 bytes      Number of bytes of the block minus 4
Blockheader  80 bytes     6 header fields
Tx counter   1 to 9 bytes Positive integer
Tx list                   List of transactions

The data structure of the blockheader fields:

Field         Size       Description

Version       4 bytes    The version of Bitcoin system
Previous hash 32 bytes   Hash of the previous block
Merkle root   32 bytes   The Merkle Root hash of transactions
Timestamp     4 bytes    Number of seconds since 1970-01-01 00:00
Bits          4 bytes    A representation of the networks current difficulty
Nonce         4 bytes    Generated by the miner to meet the hash requirement

Last update: 2017.

Table of Contents

 About This Book

 Introduction of Bitcoin

 Bitcoin Blockchain

 Bitcoin Wallet

 Bitcoin Core

 Bitcoin Transaction

 Bitcoin-Qt - Bitcoin Core GUI

 Bitcoin Mining

 Bitcoin Consensus Rules

Bitcoin Block Data Structure

 Data Components of Bitcoin Block

 Data Properties of Bitcoin Block

 Merkle Root of Bitcoin Block

 Calculate Double-SHA256 Hash with Python

 Verify Merkle Root of 2 Transactions

 Verify Merkle Root of 7 Transactions

Data Structure of Bitcoin Block

 "getblock blockhash 0" - Serialized Hex Block Data

 Block Hash Calculation Algorithm

 Block Hash Calculation in Python

 Calculate Double-SHA256 Hash with Java

 Bitcoin Transaction Data Structure

 blockexplorer.com API

 Copay - Bitcoin Wallet

 References

 PDF Printing Version