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xRWA: A Cross-Chain Framework for Interoperability of Real-World Assets

Yihao Guo, Haoming Zhu, Minghui Xu, Xiuzhen Cheng, Bin Xiao

TL;DR

The paper proposes xRWA, a cross-chain framework for Real-World Assets that leverages Decentralized Identifiers and Verifiable Credentials to securely identify and tokenize RWAs, a SPV-based protocol to prevent redundant cross-chain authentication, and a cross-chain channel to enable partial settlements without channel closures. It analyzes related work, defines rigorous security guarantees for cross-chain authentication and atomic settlement, and demonstrates feasibility and efficiency through simulation-backed analysis and a concrete implementation. Key contributions include the RWA-CC credential model, SPV-based cross-chain authentication, and a persistent cross-chain channel that reduces on-chain costs. The approach aims to unlock interoperable, scalable tokenization of RWAs across heterogeneous blockchains with practical performance benefits.

Abstract

Real-World Assets (RWAs) have recently attracted increasing attention as a means of bridging traditional financial instruments with decentralized infrastructures. By representing assets such as bonds, commodities, and real estate on blockchains, RWAs can enhance liquidity, broaden accessibility, and extend the scope of decentralized finance. Industry forecasts further suggest rapid growth of tokenized RWAs in the coming years, underscoring their potential role in the evolution of digital financial markets. However, when deployed across multiple blockchains, RWAs face challenges such as repeated authentication on different chains and inefficiency caused by multi-step settlement protocols. To address these issues, we present a cross-chain framework for RWAs that emphasizes identity management, authentication, and interaction. The framework integrates Decentralized Identifiers and Verifiable Credentials with customized attributes to support decentralized identification, and incorporates an authentication protocol based on Simplified Payment Verification to avoid redundant verification across chains. Furthermore, we design a cross-chain channel that enables the settlement of RWAs without requiring channel closure, thereby improving operational efficiency. We implement the framework and evaluate it through simulations, which confirm its feasibility and demonstrate improvements in efficiency for RWAs in cross-chain settings.

xRWA: A Cross-Chain Framework for Interoperability of Real-World Assets

TL;DR

The paper proposes xRWA, a cross-chain framework for Real-World Assets that leverages Decentralized Identifiers and Verifiable Credentials to securely identify and tokenize RWAs, a SPV-based protocol to prevent redundant cross-chain authentication, and a cross-chain channel to enable partial settlements without channel closures. It analyzes related work, defines rigorous security guarantees for cross-chain authentication and atomic settlement, and demonstrates feasibility and efficiency through simulation-backed analysis and a concrete implementation. Key contributions include the RWA-CC credential model, SPV-based cross-chain authentication, and a persistent cross-chain channel that reduces on-chain costs. The approach aims to unlock interoperable, scalable tokenization of RWAs across heterogeneous blockchains with practical performance benefits.

Abstract

Real-World Assets (RWAs) have recently attracted increasing attention as a means of bridging traditional financial instruments with decentralized infrastructures. By representing assets such as bonds, commodities, and real estate on blockchains, RWAs can enhance liquidity, broaden accessibility, and extend the scope of decentralized finance. Industry forecasts further suggest rapid growth of tokenized RWAs in the coming years, underscoring their potential role in the evolution of digital financial markets. However, when deployed across multiple blockchains, RWAs face challenges such as repeated authentication on different chains and inefficiency caused by multi-step settlement protocols. To address these issues, we present a cross-chain framework for RWAs that emphasizes identity management, authentication, and interaction. The framework integrates Decentralized Identifiers and Verifiable Credentials with customized attributes to support decentralized identification, and incorporates an authentication protocol based on Simplified Payment Verification to avoid redundant verification across chains. Furthermore, we design a cross-chain channel that enables the settlement of RWAs without requiring channel closure, thereby improving operational efficiency. We implement the framework and evaluate it through simulations, which confirm its feasibility and demonstrate improvements in efficiency for RWAs in cross-chain settings.

Paper Structure

This paper contains 22 sections, 1 theorem, 3 equations, 4 figures, 1 table, 2 algorithms.

Table of Contents

  1. Introduction
  2. Related Works
  3. RWAs in Industry
  4. RWAs in Academia
  5. Summary and Motivations
  6. Preliminaries
  7. Decentralized Identifiers
  8. Verifiable Credentials
  9. Simple Payment Verification
  10. Off-Chain Channel
  11. Hashed Timelock Contracts
  12. xRWA
  13. Overview
  14. Design Goals
  15. Identification and Tokenization
  16. ...and 7 more sections

Key Result

Theorem 1

Assume that the underlying DID and VC infrastructure is secure, meaning that no PPT adversary can cause a verifier to accept an identity or credential that was not honestly issued by an authorized issuer, except with negligible probability. Assume further that the SPV proof system is sound for trans

Figures (4)

  • Figure 1: The multi-chain environment creates opportunities for the cross-chain circulation of RWAs. However, redundant authentication and inefficient cross-chain operations remain critical challenges.
  • Figure 2: xRWA comprises three functional layers: (i) asset identification and tokenization, where DIDs and VCs are used to represent real-world assets on-chain; (ii) cross-chain authentication, which prevents repeated registration across heterogeneous blockchains; and (iii) cross-chain interaction through channel-based settlement, enabling efficient trading of RWAs.
  • Figure 3: Latency in issuing and verifying VCs.
  • Figure 4: Verification time of SPV proofs under varying transaction counts.

Theorems & Definitions (9)

  • Definition 1: DID Operations
  • Definition 2: VC Operations
  • Definition 3: SPV
  • Definition 4: Off-Chain Channel
  • Definition 5: HTLC
  • Definition 6: RWA Security
  • Definition 7: Cross-Chain Channel
  • Theorem 1: Security of xRWA
  • proof