Protocol Architecture

QBridge’s architecture is modular, compliant, and resilient — built to satisfy both institutional demands and on-chain composability. It consists of five key components working together to enable secu

🧱 Core Components

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🔐 1. Quantum-Secure Bridge Nodes

Validators operate using post-quantum signature schemes (e.g., Dilithium, Kyber). These nodes:

• Verify cross-chain transactions

• Sign metadata packets with quantum-resistant signatures

• Participate in consensus for compliance enforcement

💡 Think of them as the secure validators of RWA movement, not just token flows.

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⚖️ 2. RWA Policy Engine

This is the on-chain programmable logic that governs:

• KYC / AML enforcement

• Jurisdiction rules

• Whitelist/blacklist rules

• Role-based access to asset transfer

📎 Example policy logic:

solidityCopyEditrequire(
  isWhitelisted(msg.sender) &&
  isJurisdictionAllowed(msg.sender, destinationChain),
  "Transfer not permitted"
);

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🧾 3. zkLedger Audit Trail

Every event (lock, mint, burn, release) is recorded on a zero-knowledge ledger:

• Aggregated data per chain, per asset, per transfer type

• Auditor view is opt-in and privacy-preserving

• Compliant with GDPR, MiCA, HKPDPO

🔍 This makes QBridge the only bridge with regulator-grade visibility + user privacy.

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🧠 4. AI Verification Oracle

This oracle:

• Assesses counterparty risks

• Validates identity attestations

• Scores the legality of transfer requests

🧠 Machine learning ensures dynamic compliance adaptation across regions.

🧪 Example: If sanctions or laws change in a jurisdiction, the oracle flags and halts illegal transfers immediately.

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🛰️ 5. Cross-Layer Messaging Bus

A secure relay framework that:

• Supports Solana (SVM), Ethereum (EVM), Polygon, L2s

• Delivers asset payloads + metadata across chains

• Integrates with native RWA token standards

📦 Transfers aren’t just balances — they’re context-aware, identity-bound asset states.

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🌐 Supported Chains

• ✅ Ethereum & L2s (Arbitrum, Optimism, Base)

• ✅ Solana

• ✅ Polygon

• ✅ Avalanche

• 🔜 Cosmos (via IBC – Q2 2026 roadmap)

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🧠 Visual Suggestion: Architecture Diagram

• Core node cluster at center

• Side branches: zkLedger, AI Oracle, Messaging Bus

• Chain logos with arrows leading into/out of the bridge

• Policy Engine layered across transfer paths