Supply Chain Transparency Blockchain

This project implements a simple blockchain to track the journey of food products in a supply chain. It ensures transparency by allowing consumers to verify the origin and quality of their food.

Project Overview

Objective: To create a blockchain that records the journey of food products, allowing consumers to verify their source and quality.
Key Features:
- Add food product entries to the blockchain.
- Each entry includes details such as product name, origin, timestamp, and previous entry hash.
- Display the entire supply chain for a product.

File Structure

supply_chain.py: The main Python script that contains the blockchain implementation.

How It Works

Classes

Block Class:
- Represents a single block in the blockchain.
- Attributes:
  - index: Position of the block in the chain.
  - previous_hash: Hash of the previous block.
  - timestamp: Time when the block was created.
  - data: Information about the food product.
  - hash: Unique hash of the block, calculated using SHA-256.
- Methods:
  - calculate_hash(): Generates a SHA-256 hash for the block based on its attributes.
SupplyChain Class:
- Manages the chain of blocks.
- Attributes:
  - chain: A list that holds all the blocks in the blockchain.
- Methods:
  - create_block(data): Creates a new block with the provided data and appends it to the chain.
  - display_chain(): Prints out the details of each block in the supply chain.

Example Usage

You can run the supply_chain.py script to see how the blockchain works. Here’s how to do it:

Install Python: Make sure you have Python installed on your system.
Clone the Repository: If you have this code in a repository, clone it to your local machine.
Navigate to the Directory: Open your terminal or command prompt and navigate to the directory where supply_chain.py is located.
Run the Script:
```
python supply_chain.py
```

Expected Output Index: 1 Previous Hash: 0 Timestamp: 1700000000.0 Data: Genesis Block Hash: 5e884898da28047151d0e56f8dc6292773603d0d4c1f1c1c1c1c1c1c1c1c1c1

Index: 2 Previous Hash: 5e884898da28047151d0e56f8dc6292773603d0d4c1f1c1c1c1c1c1c1c1c1 Timestamp: 1700000001.0 Data: Tomatoes from Farm A Hash: 6dcd4ce23d88e2ee9568ba546c007c63a0c1c1c1c1c1c1c1c1c1c1c1c1c1