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Ethereum: Bitcoin-Qt source code walkthrough

Published by Terlumun Aondover on February 11th, 2025.

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Understanding Bitcoin-Qt Source Code – Step-by-Step Guide

The Bitcoin-Qt source code is a crucial component of the Bitcoin blockchain project, and while it is not possible to create a comprehensive guide covering every aspect of its architecture, we will provide a walk-through of the key components and concepts.

Introduction to Bitcoin-Qt

Bitcoin-Qt is an open-source implementation of the Bitcoin protocol, written in C++ by Satoshi Nakamoto. It is the most widely used version of the Bitcoin software, and most Bitcoin nodes run on this platform.

Overview of the Source Code Structure

The Bitcoin-Qt source code can be divided into several layers:

1. bitcoin.h and bitcoin.cpp

These header files provide the interface for interacting with the Bitcoin blockchain. They define data structures, functions, and macros used throughout the project.

bitcoin.h:

`c


#sindef BITCOIN_H
#define BITCOIN_H
#include 
#include "bloques.h"
// Data structure representing a block
structure typedef {
int64_t hash;
uint256_data data;
} Block;
//Function to generate a new block
void genesis_block();
#endif // BITCOIN_H

bitcoin.cpp:c
#include "bitcoin.h"
#include 
//Function to create a new block
void create_new_block(Block *block) {
// Generate the block header
BlockHeader header;
// ...
}
//Function to update block data
void update_block_data(Block *block, uint256_data new_data) {
// Update block hash and data
block->hash = …;
block->data = …;
}

2. blocks.handblock.cpp


This header file defines a block structure and provides functions to create blocks, update block data, and generate block headers.


blocks.h:

c


#ifndef BLOCKS_H
#define BLOCKS_H
#include "bitcoin.h"
// Structure representing a block
structure typedef {
int64_t hash;
uint256_data data;
} Block;
//Function to generate block header
Block header *generate_block_header();
#endif // BLOCKS_H

block.cpp:c
#include "blocks.h"
#include 
// Function to create a new block header
Block header *create_new_block_header() {
// Generate the block header
BlockHeader header;
// ...
}
//Function to update block data
void update_block_data(Block *block, uint256_data new_data) {
// Update block hash and data
block->hash = …;
block->data = …;
}

3. network.handnet.cpp


This header file defines network-related functionality and provides functions to create connections to other nodes.


network.h:

c


#ifndef RED_H
#define RED_H
#include "bitcoin.h"
// Structure representing a connection to another node
structure typedef {
// ...
} Connection;
//Function to create a new connection
Connection *create_new_connection();
#endif // RED_H

red.cpp:c
#include "red.h"
#include 
// Function to update block data in another node's memory
void update_block_data_in_node(Connection connection, Block block) {
// Update block hash and data in other node's memory
connection->hash = …;
connection->data = …;
}




Tutorial example
Let's create a simple example to demonstrate how to use the Bitcoin-Qt source code. We'll create a new block, update its data, and then generate a block header.