Blockchain

Building the Tiniest Blockchain - Gerald Nash

This is the tenth lab from Professor Kevin Lu's iot GitHub

Here we create a small blockchain program and run it on our computers.

Up first is the usual installation of flask and requests (if you don't already have them)

$ pip3 install flask requests

And then some setting up.

First we will run the below commands to get a feel for hashing out some text. There will be quite a bit of output. I did not picture mine below for space saving purposes

$ cd ~/iot/lesson10

$ python3 hash_value.py

$ python3 snakecoin.py

$ python3

>>> import hashlib

>>> m=hashlib.sha256(b"hello, world")

>>> m.hexdigest()

>>> m.digest_size

>>> m.block_size

>>> exit()

Next, we will need two terminals to run the app and set up the flask server

On the first terminal I ran :

$ git clone https://github.com/satwikkansal/python_blockchain_app.git

$ export FLASK_APP=node_server.py

$ cd ~/python_blockchain_app

$ flask run --port 8000

And on a second terminal I ran:

$ cd ~/python_blockchain_app

$ python3 run_app.py

Then, I opened up my browser and navigated to localhost:5000 and ran the blockchain app!

Unfortunately, I do not have a Raspberry Pi or a MAM sensor currently available to me, so I was unable to complete the IOTA section of this lab.