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Python Blockchain

Blockchain implementation using Python.

What I learned

  • How to implement blockchain.
  • What is Proof of Work.
  • How to use Flask.

Prerequisites

  • python3
  • pipenv

How to start nodes

  1. Install dependencies. 
    pipenv install
  2. Activate virtualenv. 
    pipenv shell
  3. Start node 1. 
    python3 -m server 5000
  4. Start node 2 on a different port in a different window. 
    pipenv shell
python3 -m server 5001

Usage

# Create a new transaction.
curl -X POST -H "Content-Type: application/json" -d '{
 "sender": "d4ee26eee15148ee92c6cd394edd974e",
 "recipient": "someone-other-address",
 "amount": 5
}' "http://localhost:5000/transactions/new"

# Mine a new block.
curl "http://localhost:5000/mine"

# Get the blockchain.
curl "http://localhost:5000/chain"

# Register node 2 on node 1.
curl -X POST -H "Content-Type: application/json" -d '{
   "nodes": ["http://localhost:5001"]
}' "http://localhost:5000/nodes/register"

# Mine some new blocks on node 2.
curl "http://localhost:5001/mine"
curl "http://localhost:5001/mine"
curl "http://localhost:5001/mine"

# Get the blockchain of node 2.
curl "http://localhost:5000/chain"

# Replace the blockchain of node 1 with that of node 2 by the Consensus Algorithm.
curl "http://localhost:5000/nodes/resolve"

# Get the blockchain of node 1. 
curl "http://localhost:5000/chain"

References