A minimal blockchain built with Python and Flask, written for learning rather than production. It covers the essentials end to end: blocks, hashing, proof of work, transactions, and consensus between nodes.
You can spin up multiple nodes locally on different ports and watch them sync chains and resolve conflicts — which is where blockchain concepts actually click:
python blockchain.py # node 1 on :8000
python blockchain.py -p 8001 # node 2
python blockchain.py -p 8002 # node 3The full walkthrough is on Medium.