Blockchain for Secure Data Sharing between Organizations

Objective:

To develop a blockchain-based system that enables secure, transparent, and permissioned data sharing among multiple organizations, reducing data breaches and ensuring trust without relying on intermediaries.

Key Features:

Data Integrity – Shared data is immutable and tamper-proof.

Access Control – Only authorized parties can access specific data.

Auditability – All access and changes are recorded in real time.

Encryption & Privacy – Data is encrypted and optionally stored off-chain.

Smart Contracts – Automate data access policies and permissions.

Interoperability – Supports data exchange across different IT systems.

Permissioned Blockchain – Only verified organizations can participate.

Technologies Used:

Blockchain Platform: Hyperledger Fabric, Ethereum (private network), or Corda

Smart Contract Language: Chaincode (Hyperledger) or Solidity

Frontend: Angular/React for dashboard

Backend: Node.js / Python

Data Encryption: AES / RSA encryption standards

Storage: On-chain metadata, off-chain data (e.g., IPFS, cloud)

Identity Management: Public-private key pairs, digital certificates

How It Works:

Onboarding: Each organization joins the network and is given unique credentials.

Data Upload: Data is encrypted and uploaded (off-chain); a hash and access policy are stored on the blockchain.

Access Request: An organization requests access via a smart contract.

Authorization: If access conditions are met, the smart contract grants permission.

Data Retrieval: Approved users decrypt and access the off-chain data.

Logging: Every access and modification is immutably logged on-chain.

Benefits:

Security – Encrypted, immutable, and access-controlled data exchange.

Trust – Shared ledger builds confidence among competing or independent entities.

Efficiency – Reduces paperwork, delays, and manual verification.

Transparency – Every action is traceable and auditable.

Regulatory Compliance – Easier tracking for GDPR, HIPAA, etc.

Scalability – Supports multi-party collaboration with minimal overhead.