To test your application I recommend you to use POSTMAN, this tool will help you to make the requests to the API.

1. Run your application using the command node app.js You should see in your terminal a message indicating that the server is listening in port 8000:

Server Listening for port: 8000

2. To make sure your application is working fine and it creates the Genesis Block you can use POSTMAN to request the Genesis block: Request: http://localhost:8000/block/0
3. Make your first request of ownership sending your wallet address: Request: http://localhost:8000/requestValidation
4. Sign the message with your Wallet: Use the Wallet to sign a message
5. Submit your Star Request: http://localhost:8000/submitstar
6. Retrieve Stars owned by me Request: http://localhost:8000/blocks/<WALLET_ADDRESS>