BlockChain in Python and Flask

• Flask-RESTful API + Mine + Distributed Ledger + Decentralize & Consensus

Note

Wish to get familiar with the recently famous concepts of Blockchain and Distributed Ledgers?

Want to create your own sexy Cryptocurrencies similar to Bitcoins, Litecoins?

And even more details on how it works in python code?

This repo will provide you a brief and clear sample and appropriate comments to help understand.

Prepare

Make sure you have Python 3 installed:

brew install python3

or update

brew update python

Usage

clone the repo to your local

git clone https://github.com/zhengyangca/FlaskBlockChain

then install required packages

pip install -r requirements.txt

Access the root directory and launch the Blockchain Web Services:

cd ~/path-to-your-local-repo

python FlaskBlockChain.py

APIs:

1. Mine

http://localhost:5000/mine

2. Transactions

Use Postman or cURL make a post with json values:

localhost:5000/transactions/new

with raw value:

{
 "sender": "4bb926b6dca14df48a664f2e6fbd559e", // change 
  to your client ID. 
 "recipient": "someone else's address",
 "amount": 5
}

3. Check all chains of transactions

localhost:5000/chain

4. Consensus

add Nodes and always synchronize the longest chain to each node

try run the python client twice with different ports: python FlaskBlockChain.py -p 5000 and in another Terminal python FlaskBlockChain.py -p 5001

Now register the second to the first node:

post localhost:5000/nodes/register with value

{
"nodes" : ["http://localhost:5001"]
}

Then mine at port 5001 few more times and run resolve for the 5000 node

localhost:5000/nodes/resolve

You will found the chain was replaced by the Consensus Algorithm.