Proof-Of-Concept

This repository contains the source code for depicting the proof of concept of the idea proposed.

Create a virtual environment

virtualenv blockchain
source blockchain/bin/activate

Install the required libraries and packages

pip install -r requirements.txt

Run the verification server to verify the Device certificates against the CA chain

python3 app.py

Help menu

python3 blockchain.py -h

usage: blockchain.py [-h] [--method {add,remove,viewnode,broadcast}] [--certificate CERTIFICATE] [--fullnode]
                     [--deviceid DEVICEID] [--node NODE] [--state STATE] [--start] [--cpath CPATH]
                     [--src_nodes SRC_NODES] [--dest_nodes DEST_NODES] [--max_noise MAX_NOISE]

This simulates the Proof of Concept for the blockchain with Proof of Verified Authority Consensus

options:
  -h, --help            show this help message and exit
  --method {add,remove,viewnode,broadcast}
                        This argument facilitates choosing the action on a node
  --certificate CERTIFICATE
                        The argument enables you to specify the path to the device certificate file
  --fullnode            This is a flag to indicate if the device is a full node
  --deviceid DEVICEID   This argument specifies the device ID
  --node NODE           This argument specifies the node index for the viewnode method
  --state STATE         This argument specifies the path to payload file containing the state
  --start               This flag indicates to start a new a new blockchain
  --cpath CPATH         This argument takes in the path to store the chain persistently
  --src_nodes SRC_NODES
                        This argument takes in the path that contains the pre-added nodes
  --dest_nodes DEST_NODES
                        This argument takes in the path to store the newly added or updated nodes
  --max_noise MAX_NOISE
                        This argument takes the maximum permissable network noise for broadcast [value between 0-1]

Test

Registration of a Device

Add a device with expired/invalid certificate

The device certificate in test1/ has expired and hence it is not valid.

python3 blockchain.py --fullnode --method add --deviceid 34 --certificate test1/BEC452C7-B079-4C99-57CC.e48BC-B809.pem

Add a device with a valid certificate from the trusted CA

The device certificate in test2/ has a valid certificate.

python3 blockchain.py --fullnode --method add --deviceid 83 --certificate test2/BEC452C7-B079-4C99-57CC.e48BC-B809.pem --src_nodes nodes.json

Broadcast and verification

Sending a state change

Starting a new blockchain and adding a transaction. payload1.json has the data of a state change.

python3 blockchain.py --method broadcast --state states/payload_1.json --start

Increasing the network noise in simulation

python3 blockchain.py --method broadcast --state states/payload_1.json --max_noise 0.7

Adding the next transaction

python3 blockchain.py --method broadcast --state states/payload_2.json