🦀 ShadowOS SDK (Rust)

The Official Rust SDK for the x402 Invisible Layer of the Financial Internet

Private by default • Provable on demand

🚀 Why ShadowOS SDK?

ShadowOS SDK is a high-performance Rust library that enables developers to build privacy-first payment applications with zero-knowledge cryptography and AI-verified identity.

ShadowOS ($SOS) lets value move without trails. Prove only what's needed — zk-ID, private settlement, and redacted receipts, all composable with your stack.

Core Philosophy

• Private by default: All transactions are invisible by design
• Provable on demand: Generate selective disclosure proofs when needed
• Trust × Privacy: Mathematical guarantees over social promises
• ZK + AI: Zero-knowledge proofs fused with AI reasoning
• Beyond Blockchain: Reputation over identification

Key Features

• 🔒 x402 Stealth Payments: Per-use payments with selective proofs and redacted receipts
• 🤖 AI-Pseudonym Reputation: Proofs not profiles — provable behavior generates attestations
• 🌐 Cross-Chain Privacy Fabric: Layer-agnostic protocol bridging privacy across ecosystems
• 🏦 Private Merchant Bridge: Anonymous checkout with policy controls
• ⚡ Blazing Fast: Rust performance for production-grade applications
• 🛡️ Memory Safe: Rust's safety guarantees for cryptographic operations
• 📦 Easy Integration: Simple API for complex privacy features

ShadowOS Products

• GhostPay: Invisible payment processing
• Shadow Vaults: Private treasury management
• Blind Oracles: Privacy-preserving data feeds
• zk-ID Minimizer: Minimal identity disclosure

📊 Why Rust?

Feature	Benefit
Performance	Near C++ speed, perfect for cryptographic operations
Memory Safety	No segfaults, no data races - critical for financial apps
Zero-Cost Abstractions	High-level APIs with zero runtime overhead
Cross-Platform	Compile to WebAssembly, native binaries, mobile
Production Ready	Used by major blockchain projects (Solana, Polkadot)

🎯 Use Cases

1. Privacy-Preserving Wallets

Build wallets that enable invisible transactions while maintaining verifiability.

use shadowos_sdk::stealth::X402StealthPayment;
use shadowos_sdk::field::FieldElement;

let mut stealth = X402StealthPayment::new();
let payment = stealth.create_payment(stealth_address, amount)?;
let proof = stealth.generate_proof(0, &public_inputs)?;

2. Merchant Payment Gateways

Accept payments privately without accessing customer data.

use shadowos_sdk::bridge::PrivateMerchantBridge;

let mut bridge = PrivateMerchantBridge::new();
bridge.register_merchant(merchant_config)?;
let invoice = bridge.create_invoice(merchant_id, amount)?;
let receipt = bridge.process_payment(invoice_id, pseudonym, amount, chain)?;

3. DAO Treasury Management

Manage DAO funds invisibly with compliance-proof distributions.

use shadowos_sdk::reputation::AIReputationEngine;

let mut engine = AIReputationEngine::new();
let identity = engine.create_identity_shadow()?;
engine.update_reputation(&identity.pseudonym, InteractionType::Payment, 1.0)?;
let proof = engine.generate_reputation_proof(&identity.pseudonym, min_score)?;

4. Cross-Chain Privacy Bridges

Enable private transactions across multiple blockchain networks.

use shadowos_sdk::cross_chain::{Chain, convert_amount};

let eth_config = Chain::Ethereum.config();
let amount = convert_amount(1000000u64, 18, 6); // ETH to USDC decimals

🏗️ Architecture

shadowos-sdk/
├── src/
│   ├── core/              # Cryptographic primitives
│   │   ├── field.rs       # Finite field arithmetic
│   │   ├── polynomial.rs  # Polynomial operations
│   │   └── merkle.rs      # Merkle tree commitments
│   ├── stealth/           # x402 stealth payments
│   │   └── x402.rs
│   ├── reputation/        # AI-pseudonym reputation
│   │   └── engine.rs
│   ├── bridge/            # Merchant bridge
│   │   └── merchant.rs
│   ├── security/          # Security utilities
│   │   ├── constant_time.rs
│   │   └── key_derivation.rs
│   └── utils/             # Cross-chain & utilities
│       └── cross_chain.rs

📦 Installation

Add to your Cargo.toml:

[dependencies]
shadowos-sdk = { version = "0.1.0", features = ["stealth", "reputation", "bridge"] }

Or install from crates.io:

cargo add shadowos-sdk

🚀 Quick Start

Basic Stealth Payment

use shadowos_sdk::prelude::*;

fn main() -> Result<(), ShadowOSError> {
    // Initialize stealth payment system
    let mut stealth = X402StealthPayment::new();

    // Create stealth address
    let stealth_address = generate_stealth_address()?;

    // Create payment
    let amount = 1_000_000u64; // 1 USDC (6 decimals)
    let payment = stealth.create_payment(stealth_address, amount)?;

    // Generate zero-knowledge proof
    let public_inputs = vec![
        FieldElement::from(amount),
        FieldElement::from(payment.timestamp),
    ];

    let proof = stealth.generate_proof(0, &public_inputs)?;

    // Verify proof
    let root = stealth.get_root().ok_or("No root available")?;
    let is_valid = stealth.verify_proof(&proof, &root)?;

    println!("Proof is {}", if is_valid { "valid" } else { "invalid" });
    Ok(())
}

AI-Pseudonym Reputation

use shadowos_sdk::prelude::*;

fn main() -> Result<(), ShadowOSError> {
    // Initialize reputation engine
    let mut engine = AIReputationEngine::new();

    // Create identity shadow
    let identity = engine.create_identity_shadow()?;

    // Update reputation through interactions
    engine.update_reputation(
        &identity.pseudonym,
        InteractionType::Payment,
        1.0
    )?;

    // Generate reputation proof (without revealing exact score)
    let min_score = 3.0;
    let proof = engine.generate_reputation_proof(&identity.pseudonym, Some(min_score))?;

    // Verify proof
    let is_valid = engine.verify_reputation_proof(&proof, Some(min_score))?;

    println!("Reputation proof is {}", if is_valid { "valid" } else { "invalid" });
    Ok(())
}

Private Merchant Bridge

use shadowos_sdk::prelude::*;

fn main() -> Result<(), ShadowOSError> {
    // Initialize bridge
    let mut bridge = PrivateMerchantBridge::new();

    // Register merchant
    let merchant_config = MerchantConfig {
        merchant_id: "merchant-001".to_string(),
        stealth_address: generate_stealth_address()?,
        min_reputation_score: Some(3.0),
        accepted_chains: vec!["ethereum".to_string(), "polygon".to_string()],
    };

    bridge.register_merchant(merchant_config)?;

    // Create private invoice
    let invoice = bridge.create_invoice("merchant-001", 5_000_000u64, 3600)?;

    // Process payment (customer remains anonymous)
    let customer_pseudonym = generate_pseudonym()?;
    let receipt = bridge.process_payment(
        &invoice.invoice_id,
        &customer_pseudonym,
        5_000_000u64,
        "ethereum"
    )?;

    // Verify receipt
    let root = bridge.get_payment_root().ok_or("No root available")?;
    let is_valid = bridge.verify_receipt(&receipt, &root)?;

    println!("Receipt is {}", if is_valid { "valid" } else { "invalid" });
    Ok(())
}

🔧 Features

Core Features

• ✅ Finite Field Arithmetic: 251-bit STARK-friendly prime field
• ✅ Polynomial Operations: Evaluation, interpolation, FRI protocol
• ✅ Merkle Trees: Cryptographic commitments with inclusion proofs
• ✅ Zero-Knowledge Proofs: x402 stealth payment protocol
• ✅ AI Reputation Engine: Pseudonymous identity and reputation scoring
• ✅ Merchant Bridge: Privacy API for Web3 commerce

Security Features

• ✅ Constant-Time Operations: Timing attack resistant
• ✅ Secure Key Derivation: HKDF and PBKDF2 support
• ✅ Input Sanitization: Protection against injection attacks
• ✅ Secure Random: Cryptographically secure random generation
• ✅ Memory Safety: Rust's ownership system prevents memory bugs

Cross-Chain Support

• ✅ Ethereum
• ✅ Polygon
• ✅ BSC (Binance Smart Chain)
• ✅ Solana
• ✅ Arbitrum
• ✅ Optimism
• ✅ Avalanche

📚 Documentation

• API Documentation - Full API reference
• Examples - Complete working examples
• Architecture Guide - System design overview
• Security Guide - Security best practices
• Performance Guide - Optimization tips

🎓 Examples

Check out the examples directory:

• stealth_payment.rs - Basic stealth payment flow
• reputation_proof.rs - Reputation proof generation
• merchant_bridge.rs - Merchant payment processing
• cross_chain.rs - Multi-chain operations
• batch_payments.rs - Batch payment processing

Run examples:

cargo run --example stealth_payment
cargo run --example reputation_proof
cargo run --example merchant_bridge

⚡ Performance

Benchmarks

Operation	Time	Throughput
Payment Creation	~50μs	20,000 ops/sec
Proof Generation	~250ms	4 ops/sec
Proof Verification	~50ms	20 ops/sec
Reputation Update	~10μs	100,000 ops/sec

Benchmarked on Apple M1 Pro, Rust 1.75

🔒 Security

ShadowOS SDK follows industry best practices:

• Memory Safety: Rust's ownership system prevents memory vulnerabilities
• Constant-Time: All cryptographic comparisons are timing-attack resistant
• Secure Random: Uses OS-provided cryptographically secure RNG
• No Unsafe Code: Core cryptographic operations use safe Rust
• Audited: Regular security audits and code reviews

🤝 Contributing

We welcome contributions! Please see CONTRIBUTING.md for guidelines.

Development Setup

# Clone repository
git clone https://github.com/ShadowOsapp/shadow-os-sdk-rust.git
cd shadow-os-sdk-rust

# Run tests
cargo test

# Run benchmarks
cargo bench

# Build documentation
cargo doc --open

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🔗 Links

• Website: shadowos.app - The invisible layer of the financial internet
• Documentation: shadowos.gitbook.io - Complete technical docs
• Twitter: @ShadowOSapp - Follow for updates
• GitHub: github.com/ShadowOsapp/shadow-os-sdk-rust
• Crates.io: crates.io/crates/shadowos-sdk (Coming soon)
• Launch dApp: shadowos.app - Try ShadowOS now

🎯 ShadowOS Vision

The vision of ShadowOS is simple yet profound: to create a global, intelligent payment fabric where trust and privacy coexist through mathematical truth.

By integrating zero-knowledge cryptography with AI reasoning, ShadowOS envisions a decentralized economy where anyone can prove reputation, perform commerce, and transact securely without ever exposing their identity or data.

This vision extends far beyond blockchain — it's about reshaping the human relationship with digital identity. ShadowOS imagines a world where reputation replaces identification, where trust is earned through verifiable behavior, not disclosure, and where AI protects users rather than surveils them.

🙏 Acknowledgments

• Built with ❤️ using Rust
• Inspired by zero-knowledge proof research from STARKs
• Special thanks to the Rust cryptography community
• Part of the ShadowOS ecosystem

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The invisible layer of the financial internet. 🦀

Private by default • Provable on demand