add SoundVault vApp proposal by Mankgrx69

submissions/defi/Mankgrx69.md

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+# vApp Submission: SoundVault
+
+## Verification
+```yaml
+github_username: "Mankgrx69"
+discord_id: "881554897839988746"
+timestamp: "2025-10-07"
+```
+
+## Developer
+- **Name**: Shinji
+- **GitHub**: @Mankgrx69
+- **Discord**: yhwach#7704
+- **Experience**: Web3 user, DeFi explorer, and early builder focused on zk reputation, soundness proofs, and testnet-layer experimentation.
+
+## Project
+
+### Name & Category
+- **Project**: SoundVault
+- **Category**: defi
+
+### Description
+SoundVault is a decentralized vault and lending system built on the Soundness Layer.
+It uses zk reputation proofs to let users borrow assets based on verified credibility instead of over-collateralizing their funds.
+
+The main problem in DeFi lending is that users need to lock huge amounts of collateral, making it inefficient and unattractive for small participants.
+SoundVault fixes that by allowing verified reputation (through Soundness proofs) to act as trust signals.
+Higher reputation means higher borrowing power, while privacy remains protected.
+
+### SL Integration  
+SoundVault connects directly with the Soundness Layer for:
+
+Generating zk proofs using the Soundness CLI.  
+Verifying proofs on-chain through the Soundness SDK.  
+Recording loan-related attestations in the Soundness Layer for transparency.  
+Running a local CLI demo that simulates proof creation, verification, and borrowing flow.
+
+## Technical
+
+### Architecture
+A user creates a zk reputation proof with the Soundness CLI.  
+The proof is sent to the VaultManager smart contract.  
+The contract verifies the proof using a Soundness verifier adapter.  
+Once verified, the contract assigns a borrowing limit based on the user’s reputation class (A/B/C).  
+The transaction and attestation record are stored in the Soundness Layer for auditability.
+
+### Stack
+- **Frontend**: Next.js with Ethers.js  
+- **Backend**: Node.js for CLI automation and RPC calls  
+- **Blockchain**: Ethereum Sepolia + Soundness Layer  
+- **Storage**: IPFS for proof and metadata
+
+### Features
+1. Reputation-based lending where credibility defines loan size  
+2. Private multi-asset vault for ETH and ERC-20 tokens  
+3. Integration with Soundness proof verification  
+4. CLI demo that walks through proof → verify → borrow  
+
+## Timeline
+
+### PoC (2-4 weeks)
+The Proof of Concept will focus on getting the base system running and verifying simple proofs.
+
+- [x] Create and deploy basic VaultManager contract for deposits and withdrawals  
+- [x] Integrate Soundness CLI for generating mock reputation proofs  
+- [ ] Build simple CLI interface to simulate the full borrow flow  
+- [ ] Run local testing on Sepolia to confirm proof verification works  
+- [ ] Prepare PoC report for Soundness team review  
+
+### MVP (4-8 weeks)
+The MVP will expand the core features and integrate fully with the Soundness Layer.
+
+- [ ] Build minimal Next.js dashboard for deposits, borrowing, and repayment  
+- [ ] Replace mock verifier with real Soundness Layer SDK integration  
+- [ ] Add multiple reputation classes (A, B, C) that affect loan-to-value (LTV) ratios  
+- [ ] Support multiple tokens (ETH, USDC, and custom ERC-20s)  
+- [ ] Deploy to testnet and register proof events in the Soundness Layer  
+
+---
+
+## Innovation
+SoundVault introduces the concept of **reputation as credit** in DeFi.  
+Instead of users proving trust with locked funds, they prove it with zk-attested credibility verified by the Soundness Layer.  
+
+This approach reduces over-collateralization, keeps sensitive data private, and demonstrates how zk proofs can work in real lending environments.  
+It’s a unique step toward privacy-first financial identity systems — allowing DeFi to evolve from collateral-based to reputation-based trust.
+
+Users will use SoundVault because:  
+- It’s simpler and cheaper to borrow  
+- It rewards consistent, positive on-chain behavior  
+- It maintains full user privacy through zk verification  
+
+---
+
+## Contact
+**Discord:** yhwach#7704  
+**GitHub:** [@Mankgrx69](https://github.com/Mankgrx69)  
+**Preferred Contact:** Direct message on Discord or tag in Soundness Dev Playground  
+**Updates:** Progress and demo results will be shared in GitHub commits and Discord threads during PoC and MVP phases  
+
+---
+
+**Checklist before submitting:**  
+- [ ] All fields completed  
+- [ ] GitHub username matches PR author  
+- [ ] SL integration explained  
+- [ ] Timeline is realistic