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Blockchain · Mini Project
Build a Blockchain from Scratch in Python
Blocks, proof of work and peer sync behind a small Flask API
1-2 weeks build
Overview
Builds a working blockchain without any framework, so every idea is visible in code: SHA-256 hashing, linked blocks, a mempool of signed transactions and a tunable proof-of-work puzzle. Several Flask nodes run on different ports, register each other and settle disagreements with the longest-valid-chain rule. A small web page shows each node's chain live.
What makes it stand up
- 01Block structure and SHA-256 chaining written by hand
- 02Adjustable proof-of-work difficulty
- 03Transactions signed with ECDSA key pairs
- 04Multi-node network with longest-valid-chain consensus
- 05REST endpoints to mine, transact and inspect the chain
Module breakdown
- 01
Chain
Block class, genesis block and hash-link validation.
- 02
Proof of work
Nonce search against a leading-zeros target.
- 03
Transactions
Signing, verification and a pending-transaction pool.
- 04
Networking
Node registration and chain resolution between peers.
- 05
API
Flask routes for mining, sending and viewing the chain.
After this, you will be able to
- Explain why altering one block invalidates every block after it
- Defend the longest-chain rule and its weaknesses
- Demo two nodes forking and then converging
Technology stack
- Python
- Flask
- hashlib
- Requests
- Postman
- Level
- Mini Project
- Domain
- Blockchain
- Build time
- 1-2 weeks
- Difficulty
You receive
- Complete, commented source code
- 60-90 page project report (IEEE format)
- Editable presentation deck
- Architecture, ER and UML diagrams
- Local setup and deployment guide
- Sample dataset or seed data
- Viva question bank with answers
- One 45-minute walkthrough call
- 30 days of doubt-clearing support