Cash Out

unlocking instant liquidity for freelancers & SMEs using zk powered by vLayer

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⚠️ Understanding the problem and need

Late payments in B2B markets are systemic and damaging. Trillions are trapped in unpaid invoices, especially harming freelancers and small businesses. While privacy is essential, it hinders on-chain financial transparency—until now.

Cash Out bridges the gap by offering confidential solvency proofs, tamper-proof invoice validation, and instant stablecoin payouts, all without trusting a centralized entity.

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📦 Basic Description

Cash Out is a decentralized application (dApp) that enables instant invoice claims for freelancers and SMEs using zero-knowledge proofs. Built on Rootstock and powered by vLayer, it allows businesses to prove invoice legitimacy and solvency without revealing sensitive data. All claims are executed through Rootstock’s Attestation Service and settled in stablecoins or $RIF tokens.

Technical Explainer

• 🔐 Email parsing → zkSNARK circuit → cryptographic invoice proof
• 🏦 Exchange API (e.g., Binance, Bybit) → ZK portfolio history proof
• 🌉 Teleport + Time Travel zk-modules → multi-chain liquidity average
• 📜 Rootstock Smart Contracts:
  • zk verification
  • claim processing
  • attestation link with metadata hash
• 💱 Oracle-powered price conversion using Pyth Network

All interactions are fully decentralized, permissionless, and privacy-preserving.

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🧪 Built With

• Rootstock
• vLayer
• Pyth Network
• Rootstock Attestation Service
• zkSNARKs / zk-STARKs
• Teleport & Time Travel (ZK modules)

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🧠 Product Workflow

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📜 Deployments

Roostock Testnet

CashOut - Test USDC - $RIF token -

RAS Schema -

Ethereum Sepolia

CashOutProver - CashOutVerifier - EthGlobalInvoiceProver -

Base Sepolia

Test USDC - Test LINK - Test WBTC -

OP Sepolia

Test USDC - Test LINK - Test WBTC -

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👩‍💻 Line of code

Roostock

Create User Profile Tx - Create Business Profile Tx - Create Invoice Tx - Invoice Claim Settlement Tx - Binance Proof Verification Settlement Tx - Bybit Proof Verification Settlement Tx - Crosschain Average Balance Proof Verification Settlement Tx - $RIF Usage - RAS Usage -

vLayer

Proving and claiming credit limit by verifying Binance asset history - Proving and claiming credit limit by verifying ByBit asset history - Proving and claiming credit limit by verifying cross chain average balance by using Teleport and Time Travel - Proving and claiming locked liquidity by verifying email proofs -

Pyth

Multi asset USD conversion during vLayer Proof generation - Push Oracle Service Script -

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👤 Authors

• Stinu Rabin 🛠️ Protocol Devloper
• Keesha 🔍 UI/UX Frontend

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