A very basic implementation of a blockchain - builted for educational purposes -.

Usages:

To interact with your blockchain, first you need to run the server. On command prompt, enter your project's current folder and type: $ python runserver.py

• Serving Flask app "blockchain_api" (lazy loading)
• Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead.
• Debug mode: off
• Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)

With your server up and running, to mine a block you need to make a GET request to http://localhost:/mine.

To create a new transaction and append it to the next block to be forged, make a POST request to http://localhost:/transactions/new - with the body of the post containing a JSON like the example below:

{ "sender": "m4ee26xbc15148ee92c6cd394edd974a", "recipient": "someones-address", "amount": 3 }

After creating new transactions and mining a new block, you can evaluate the current state of your entire chain by making a GET request to http://localhost:/chain.

To add new network neighbouring nodes to your list of nodes your can simply run the server on another port (runserver.py will look for an available port automatically) and make a POST request to http://localhost:/nodes/register - with the body of the request containing a json like the example below:

{ "nodes": ["http://127.0.0.1:"] }

After that, you can mine new blocks on your added node and verify its authoritativeness by making a GET request to http://localhost:/nodes/resolve - which will resolve the current state of the chain by replacing it if a valid chain is found, whose length is greaters than ours.