Blockchain-Based Peer-to-Peer (P2P) File Sharing System

Objective:

To build a secure, decentralized platform for peer-to-peer file sharing using blockchain technology, ensuring data integrity, privacy, transparency, and resistance to censorship.

Key Features:

Decentralized Storage – Files are distributed across a network of nodes (no central server).

Blockchain Integration – Tracks file ownership, transactions, and sharing activity.

Content Hashing – Files are stored/referenced using cryptographic hashes for integrity.

Access Control – Permissions are managed using smart contracts.

Incentive Mechanism – Users are rewarded (e.g., tokens) for hosting/sharing files.

Redundancy & Fault Tolerance – Files are split and replicated across nodes.

Version Control & Traceability – Users can track changes and history of shared files.

Technologies Used:

Blockchain: Ethereum / Polygon / Solana

Smart Contracts: Solidity / Rust (depending on blockchain)

Decentralized Storage: IPFS (InterPlanetary File System) / Filecoin / Arweave

Frontend: React.js / Next.js

Backend: Node.js / Express.js

Web3 Integration: Web3.js / Ethers.js

Wallets: MetaMask / WalletConnect

Encryption: AES / RSA for secure file access

How It Works:

File Upload:

A user uploads a file; it is split, encrypted, and stored on a decentralized network (e.g., IPFS).

A unique hash of the file is generated.

Blockchain Record:

The hash and metadata (owner, access rules, timestamps) are recorded on the blockchain via smart contracts.

Access & Sharing:

Others can request access; smart contracts manage permissions and verify ownership.

Users download the file via the hash, retrieving it from the distributed storage network.

Incentives:

Nodes that store and serve files earn tokens based on contribution.

Benefits:

Decentralization: No single point of failure or control.

Security & Integrity: Files are encrypted, tamper-proof, and verifiable.

Privacy: Users retain full control over their data and sharing rights.

Censorship Resistance: Data can't be easily removed or blocked.

Fair Rewards: Contributors are incentivized fairly for storage and bandwidth.

Transparency: All actions are traceable on the blockchain.