Simple Blockchain

This project implements a basic blockchain from scratch using Python and Flask. It simulates how blockchain technology works at a fundamental level — including mining blocks, validating proof-of-work, handling transactions, and achieving consensus across multiple nodes in a peer-to-peer network.

Features

• Block creation with proof-of-work (PoW)

• Transaction handling between addresses

• Genesis block initialization

• SHA-256 hashing of blocks

• Node registration and peer communication

• Consensus algorithm to resolve conflicts

• Flask-based API with endpoints to interact with the blockchain

Endpoints

Mine

Endpoint	Method	Description
/mine	Get	Mines a new block and receives reward

Transaction

Endpoint	Method	Description
/transaction/new	POST	Creates a new transaction

Get Chain

Endpoint	Method	Description
/chain	Get	Returns the full blockchain

Register Node

Endpoint	Method	Description
/nodes/register	POST	Registers new nodes in the network

Validate Chain

Endpoint	Method	Description
/nodes/resolve	Get	Reaches consensus to ensure valid chain

How It Works

• Create transactions via the /transaction/new endpoint.

• Mine blocks using proof-of-work via /mine.

• Link blocks with hashes and maintain integrity.

• Share blocks across nodes and reach consensus using /nodes/resolve.

Requirments

• Python 3

• Flask (for REST API)

• requests (for node communication)

Acknowledgements

• hackernoon