> For the complete documentation index, see [llms.txt](https://qbridge.gitbook.io/qbridge-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://qbridge.gitbook.io/qbridge-docs/introduction.md).

# Introduction

#### 🚀 What is QBridge?

**QBridge** is a quantum-secure, cross-chain bridge infrastructure purpose-built for the **$10T+ tokenized real-world asset (RWA)** economy. Unlike generic bridges that move ERC-20 tokens between chains, QBridge transfers **regulated assets** — with their metadata, ownership rights, legal wrappers, and jurisdictional logic fully preserved.

> 🧠 *Think: not just tokens, but tokenized T-bills, real estate, equity shares, and carbon credits — all compliant and composable across chains.*

***

#### 🛡 Why $QB?

The **$QB** token is the native utility layer of QBridge, used for:

* Paying cross-chain fees
* Accessing compliance modules
* Participating in protocol governance
* Staking to secure validator sets and zk-proof systems

> 📌 **Note**: $QB is also required by RWA issuers and auditors to interface with QBridge’s AI-powered compliance and audit infrastructure.

***

#### ⚔️ Our Core Philosophy

| Principle             | Description                                                                   |
| --------------------- | ----------------------------------------------------------------------------- |
| 🔐 Quantum Security   | Built using NIST-approved post-quantum cryptography like CRYSTALS-Dilithium   |
| 🧠 AI Compliance      | Enforces KYC/AML, jurisdiction checks, risk scoring, and smart policy control |
| 📦 Metadata Integrity | Cross-chain messages carry full asset metadata, legal rights, and valuations  |
| 🔎 zk Transparency    | zkLedger ensures bridge activity is audit-ready — without leaking user data   |

***

#### 🌉 Why Now?

> 🌐 **Tokenization is scaling fast —** but infrastructure is decades behind.

* BlackRock, JPMorgan, and sovereign governments are tokenizing RWAs
* But **compliance**, **interoperability**, and **security** are not solved at scale
* Existing bridges are either too DeFi-focused or too centralized

QBridge fills that gap with an **institutional-grade, modular, and regulation-first design** — **future-proofed for a quantum world**.

***

#### 🧬 Visual Suggestion:

*You can insert a 2-column comparison graphic here:*

| Legacy Bridges       | QBridge Protocol                             |
| -------------------- | -------------------------------------------- |
| ECDSA / RSA          | CRYSTALS-Dilithium / Kyber                   |
| Token-only transfers | Full asset metadata + legal wrapper          |
| No compliance        | AI-powered identity & jurisdictional control |
| Hack-prone designs   | zkLedger + policy-enforced execution         |