Simple Blockchain in C#

This is a simple implementation of a blockchain in C# with proof-of-work mining. It provides a command-line interface for interacting with the blockchain.

Commands

• add [data]: Adds a new block to the blockchain with the specified data. The block will be mined according to the current difficulty.
• validate: Checks if the blockchain is valid and prints the result.
• print: Displays all blocks in the blockchain with their details.
• exit: Stops the execution of the program.
• save: Saves the current state of the blockchain to a file named "blockchain.txt".
• load: Loads the blockchain state from a file named "blockchain.txt".

Usage

Run the program and enter commands at the prompt. For example:

add Hello, blockchain!

The system will mine the block with the current difficulty level and add it to the blockchain.

Block Structure

Each block in the blockchain has the following properties:

• Index: The position of the block in the chain.
• TimeStamp: The time when the block was created.
• PreviousHash: The hash of the previous block in the chain.
• Hash: The hash of the current block.
• Data: The data stored in the block.
• Nonce: A number used in mining to find a hash with the required difficulty.

Mining and Difficulty Adjustment

The blockchain implements a proof-of-work system where:

• Each block must be mined by finding a hash that starts with a certain number of zeros.
• The number of required zeros is the current "difficulty" level.
• The system automatically adjusts difficulty every 5 blocks.
• The target block mining time is 10 seconds.
• If blocks are being mined too quickly, difficulty increases.
• If blocks are being mined too slowly, difficulty decreases.

Disclaimer

This is a simple implementation for educational purposes and should not be used for real-world applications.