A service for authenticating the owner of a Bitcoin address

The purpose of this project is to create a method for an app or web service to verify that a person is in fact the owner of a particular Bitcoin address. In other words, to verify that they are in possession of the private key for a particular Bitcoin address without providing the private key.

Basic flow of this service is as follows:

1. Client requests a nonce from the service
2. Service responds with nonce
3. Client responds with nonce, nonce ECDSA signature created by using their Bitcoin private key, their Bitcoin public key, and their coresponding Bitcoin address
4. Service responds with verification results (success or failure of challenge response for supplied Bitcoin address, nonce, and ECDSA signature as well as whether the bitcoin address matches the supplied public key)

The nonce is comprised of the following:

1. A pseudo random number (for uniqueness)
   The server stores the time of creation for nonce expiration.

This service is built on top of Flask-RESTful http://flask-restful.readthedocs.org/en/latest/

To get started make sure you have properly installed:
Python 3.x
Flask
Flask-Restful

Once Python is installed you can install Flash and Flask-Restful using pip example:
sudo pip install Flask
sudo pip install Flask-Restful

Once you have those items installed simply launch the coinauth script. The following will launch coinauth.py using the Flask built in simple server:
python coinauth.py