HieraChain

Your task is to create a mini-application called 'SupplyChainTracker' using the Python package 'HieraChain'. This application will serve as a simplified supply chain management tool, allowing users to track products from manufacturing through distribution and sales, leveraging the hierarchical blockchain capabilities of HieraChain.

### Application Requirements:
1. **User Interface**: Develop a simple command-line interface (CLI) for user interaction. The CLI should support commands like `add_product`, `track_product`, `list_products`, and `exit`.
2. **Product Registration**: Users should be able to register new products by providing details such as product ID, manufacturer name, production date, and initial quantity.
3. **Tracking Mechanism**: Implement a feature where each transaction (such as shipment, sale, etc.) updates the product's status in the blockchain ledger. Ensure that each update is traceable and tamper-proof.
4. **Query Functionality**: Allow users to query the current status of any registered product, including its location, quantity, and all historical transactions.
5. **Security Features**: Utilize HieraChain's security features to ensure data integrity and confidentiality. Implement encryption for sensitive information and digital signatures for transaction verification.
6. **Reporting**: Provide a reporting module that generates summary reports of all transactions and product statuses, which can be saved as CSV files for further analysis.
7. **Error Handling**: Include robust error handling mechanisms to manage invalid inputs and unexpected errors gracefully.

### Utilizing HieraChain:
- Use HieraChain's hierarchical structure to organize different levels of the supply chain (e.g., Manufacturer, Distributor, Retailer).
- Leverage HieraChain's blockchain technology to ensure that every transaction is recorded immutably, maintaining a transparent and verifiable history of product movements.
- Employ HieraChain's cryptographic features for secure data storage and transmission.

### Additional Suggestions:
- Consider adding a feature to alert users via email when a product reaches a specific stage in the supply chain (e.g., out-of-stock).
- Explore integrating real-time tracking features if possible, to provide up-to-date locations of products in transit.

Your goal is to demonstrate the versatility and power of HieraChain in a practical, real-world application scenario.