Privacy-Preserving Credit Scoring.
PrivaScore
Privacy-Preserving Credit Scoring for DeFi
PrivaScore enables underbanked individuals to prove their creditworthiness without exposing their financial history. By processing sensitive data in Trusted Execution Environments (TEE), we unlock undercollateralized lending in DeFi while preserving user privacy.
The Problem
2 billion people globally are underbanked, yet they have valuable financial history:
- Mobile money payments (M-Pesa, PayPal)
- Gig economy earnings (Uber, Stripe)
- Utility and rent payments
In DeFi, they're invisible. Current lending requires:
- Over-collateralization (lock $150 to borrow $100), OR
- Exposing entire financial history on-chain forever
PrivaScore solves this by enabling credit verification without data exposure.
Our Solution
Financial Data (Private) → TEE Processing → Credit Score (Verifiable)
↓ ↓ ↓
Bank Statements AI Analysis zkProof Published
M-Pesa History Risk Assessment Score Hash On-Chain
PayPal Earnings Privacy Preserved Portable Identity
How It Works
1. Upload & Encrypt - User uploads financial documents (CSV, PDF)
2. TEE Processing - Data processed in secure enclave via iExec
3. Credit Scoring - Algorithm analyzes:
- Payment consistency (40%)
- Income stability (30%)
- Debt management (30%)
4. Verifiable Output - Only score hash published on-chain
5. Borrow - Use score across DeFi protocols
Architecture
┌─────────────────┐
│ Frontend │
│ (Next.js) │
└────────┬────────┘
│
▼
┌─────────────────┐
│ iExec Data │
│ Protector │
└────────┬────────┘
│
▼
┌─────────────────┐
│ TEE Worker │
│ (Confidential) │
│ │
│ ┌───────────┐ │
│ │ Python │ │
│ │ Credit │ │
│ │ Scorer │ │
│ └───────────┘ │
└────────┬────────┘
│
▼
┌─────────────────┐
│ Smart Contract │
│ Score Storage │
└─────────────────┘
Tech Stack
Frontend:
- Next.js 14 (App Router)
- TypeScript
- Tailwind CSS
- iExec DataProtector SDK
- ethers.js
Backend (TEE):
- Python 3.13
- iExec TEE (SCONE)
- Docker
- Arbitrum Sepolia
Blockchain:
- Arbitrum Sepolia Testnet
- iExec Protocol
- Smart Contracts for score storage
Demo Data
Sample CSV format for testing:
csv
date,amount,description
01/01/2024,2500,Salary Deposit
01/05/2024,-800,Rent Payment
01/10/2024,-200,Groceries
01/15/2024,2500,Salary Deposit
01/20/2024,-150,Utilities
02/01/2024,2500,Salary Deposit
02/05/2024,-800,Rent Payment
02/15/2024,2500,Salary Deposit
Format Requirements:
- Header row: date,amount,description
- Positive amounts = income
- Negative amounts = expenses
- Minimum 5 transactions for meaningful score
Demo Flow
1. Connect Wallet - MetaMask on Arbitrum Sepolia
2. Upload CSV - Bank statement or financial history
3. Process in TEE - Data encrypted and analyzed privately
4. View Score - Credit score (300-850) with tier classification
5. Request Loan - Use score for undercollateralized borrowing
Processing Time: 2-5 minutes
Privacy: Raw data never leaves TEE, only score hash on-chain
Privacy & Security
How Privacy is Preserved
✅ Data Encryption - End-to-end encryption before upload
✅ TEE Processing - Computation in hardware-isolated environment
✅ Zero-Knowledge Proof - Only score hash published
✅ User Control - Data owner decides who can access
✅ No Data Storage - Raw data deleted after processing
