BasicBlockChain
BasicBlockChain is a simple iOS demonstration project that implements the core ideas of a blockchain using Swift.
The app models transactions between local accounts and uses a blockchain data structure to track balances and maintain an immutable transaction history. It is designed as an educational project — focusing on clarity and core concepts rather than production-level cryptography or networking.
This project demonstrates:
- Basic blockchain data structures
- Block linking via hashes
- Transaction tracking between accounts
- Chain validation concepts
- Simple iOS app integration using Swift
Defines the fundamental block structure, typically including:
- Index
- Timestamp
- Data / transactions
- Previous block hash
- Current block hash
Each block references the hash of the previous block to ensure chain integrity.
Implements the blockchain logic:
- Genesis block creation
- Adding new blocks
- Chain storage
- Validation of the chain
Provides the UI layer that interacts with the blockchain logic and demonstrates transaction flow inside the app.
Each block contains data and a cryptographic hash:
Block(n) -> hash(Block(n-1))
Because every block depends on the previous hash, modifying one block would invalidate all subsequent blocks — creating immutability.
- Xcode (latest recommended version)
- iOS 13+
- Swift 5+
- Clone or download this repository.
- Open:
BlockChainApp.xcodeproj - Select an iOS Simulator or connected device.
- Build and run the app (
Cmd + R).
This project is intentionally minimal and does not include:
- Networked nodes
- Peer-to-peer synchronization
- Proof-of-work or mining
- Digital signatures
- Real cryptographic security
- Persistent storage
It is meant for learning blockchain structure fundamentals, not as a production blockchain implementation.
If you want to expand the project:
- Add SHA256 hashing using CryptoKit
- Implement proof-of-work
- Add transaction signatures
- Persist the chain locally (CoreData or file storage)
- Simulate multiple nodes
- Add block validation visualization in the UI
This project is provided for educational use.