Privacy
Private transactions with UPP
Tech Preview
UPP is live on Sepolia with a test token at preview.upd.io.
Why Privacy?
Public blockchains expose everything - balances, transactions, counterparties. UPP (Universal Private Pool) fixes this.
In the pool: Balance hidden. Amounts encrypted. Recipients unlinkable.
When needed: Viewing keys let you prove specific transactions to auditors, tax authorities, or anyone you choose.
Three Use Cases
1. Wrench Attack Prevention
High-value wallets are targets. If attackers can see your balance, they know who to rob.
Solution: Keep wealth in the private pool. No one can determine your holdings by looking at your address.
2. Business Confidentiality
On-chain transactions expose:
- Customer and supplier relationships
- Pricing and deal terms
- Cash flow patterns
Solution: Pay and receive privately. Counterparties know the details, observers don't.
3. Personal Financial Privacy
You don't post your bank statements publicly. Why should crypto be different?
Solution: Salary, medical payments, personal transactions - all private by default. Disclose selectively when needed.
How It Works
| Step | Action | Result |
|---|---|---|
| Shield | Deposit public tokens | Creates encrypted note |
| Transfer | Send within pool | Recipient gets note, you get change |
| Merge | Combine notes | Consolidate balance |
| Unshield | Withdraw to public | Tokens back in wallet |
Each operation uses a zero-knowledge proof - the network verifies correctness without seeing the details.
Privacy + Compliance
UPP isn't about hiding from regulators. It's about controlling who sees what.
ASP Layer: Association Set Providers verify that funds originate from compliant addresses. Withdrawals require proof of compliant origin.
Viewing Keys: Export transaction details for specific notes. Share with auditors, keep everything else private.
Ragequit: Original depositors can always withdraw their own funds, regardless of ASP status. No one can trap your money.
Next Steps
- SDK Quickstart - Integrate privacy into your app
- Architecture Deep Dive - Technical details
- Post-Quantum Security - Why we're moving from SNARKs to STARKs
- For Investors - Business case and market opportunity