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Blockchain for the Metaverse: A Review

Thippa Reddy Gadekallu, Thien Huynh-The, Weizheng Wang, Gokul Yenduri, Pasika Ranaweera, Quoc-Viet Pham, Daniel Benevides da Costa, Madhusanka Liyanage

arXiv:2203.09738v2cs.SI

TL;DR

The metaverse requires secure management of users’ digital content and data amid challenges in infrastructure, interoperability, privacy, and rapidly growing heterogeneous data. This survey synthesizes blockchain methods, enabling-technology impacts, projects, and future directions, concluding that blockchain has substantial potential while interoperability and technical improvements remain important research areas.

  • Problem

    The metaverse faces challenges involving infrastructure, data acquisition, interoperability, privacy, AI, and the scale and heterogeneity of generated data.

  • Method

    The paper systematically surveys blockchain applications for metaverse data management, enabling technologies, use cases, and future research directions.

  • Results

    The survey finds that blockchain has substantial potential for metaverse applications and services, including immersive experiences and decentralized interoperability.

  • Takeaways & Limitations

    Blockchain research for the metaverse should continue addressing consensus algorithms, network management, interoperability, and technical improvements.

Abstract

from arXiv · show

Since Facebook officially changed its name to Metaverse in Oct. 2021, the metaverse has become a new norm of social networks and three-dimensional (3D) virtual worlds. The metaverse aims to bring 3D immersive and personalized experiences to users by leveraging many pertinent technologies. Despite great attention and benefits, a natural question in the metaverse is how to secure its users' digital content and data. In this regard, blockchain is a promising solution owing to its distinct features of decentralization, immutability, and transparency. To better understand the role of blockchain in the metaverse, we aim to provide an extensive survey on the applications of blockchain for the metaverse. We first present a preliminary to blockchain and the metaverse and highlight the motivations behind the use of blockchain for the metaverse. Next, we extensively discuss blockchain-based methods for the metaverse from technical perspectives, such as data acquisition, data storage, data sharing, data interoperability, and data privacy preservation. For each perspective, we first discuss the technical challenges of the metaverse and then highlight how blockchain can help. Moreover, we investigate the impact of blockchain on key-enabling technologies in the metaverse, including Internet-of-Things, digital twins, multi-sensory and immersive applications, artificial intelligence, and big data. We also present some major projects to showcase the role of blockchain in metaverse applications and services. Finally, we present some promising directions to drive further research innovations and developments towards the use of blockchain in the metaverse in the future.

I. INTRODUCTION

The metaverse combines immersive technologies and virtual worlds but faces infrastructure, interoperability, privacy, and standardization challenges. This survey examines how blockchain can support metaverse data management, enabling technologies, applications, and future development.

  • I. INTRODUCTION: The metaverse integrates VR, AR, MR, and XR to provide immersive digital environments across social, industrial, educational, medical, military, and governmental applications.Digital twins, 3D visualization, and AR-based remote control or surgery are identified as representative applications.
  • I. INTRODUCTION: Metaverse deployment is constrained by limited infrastructure, experimental 5G availability, and unresolved compatibility and interoperability between virtual and physical worlds.The paper links pragmatic deployment to further research and standardization.
  • I. INTRODUCTION: Blockchain is motivated as a means to secure metaverse content and transactions while supporting user integrity, privacy, reputation, and digital-asset tracing.Its ledger structure links records through cryptographic hashing mechanisms.
  • A. Related Works and Contributions: The survey reviews blockchain applications for data acquisition, storage, sharing, interoperability, and privacy preservation in the metaverse.These perspectives are presented as responses to technical challenges in metaverse data management.
  • A. Related Works and Contributions: It also analyzes blockchain’s impact on IoT, digital twins, multi-sensory XR and holographic telepresence, artificial intelligence, and big data.The paper further examines blockchain-enabled projects including Decentraland, Sandbox, Axie Infinity, and Illuvium.
  • A. Related Works and Contributions: The paper concludes by identifying potential future research directions for blockchain-based metaverse applications and services.These directions are framed as supporting further research innovation and development.

B. Paper Organization

The paper introduces blockchain, the metaverse, and blockchain’s role in the metaverse before examining technical applications, enabling technologies, and related projects.

  • The paper then discusses blockchain applications for the metaverse from technical perspectives.These perspectives include data acquisition, storage, sharing, interoperability, and privacy preservation.
  • Blockchain’s impact on IoT, digital twins, multisensory XR applications, holographic telepresence, AI, and big data is examined.
  • The survey also discusses projects related to blockchain-enabled metaverse applications.
  • The fundamentals of blockchain, the metaverse, and blockchain’s role in the metaverse are presented first.
  • Blockchain blocks are connected through hash codes in the general blockchain structure.

B. Preliminaries of the Metaverse

The metaverse is described as a digital living space that maps real-world activities into a parallel universe through technologies including XR, digital twins, and blockchain.

  • What is the metaverse?: The metaverse transforms traditional social systems into a digital living space that maps the real world to a parallel universe.Users can work, live, and play with friends from any place in the metaverse.
  • Core technologies: The metaverse fuses emerging technologies such as 6G, AI, VR, and digital twins.
  • Core technologies: Extended reality includes AR, which overlays digital information onto physical environments, and VR, which provides vivid digital-world experiences.
  • Core technologies: Digital twins establish virtual counterparts of real-world objects using real-world data to predict expected behavior.
  • Blockchain connection: Blockchain-based NFTs allow virtual goods to become physical objects and enable users to trade virtual items as in the real world.
  • Applications: Popular metaverse applications include online video conferencing, digital real estate, and digital arts.

C. Role of Blockchain in the Metaverse

Blockchain is presented as infrastructure for the metaverse’s economic activity, trusted interactions, digital assets, and data protection through decentralization, transparency, and immutability.

  • Motivations: Blockchain integration is motivated by privacy and security, data quality, secure sharing, interoperability, and data integrity.
  • Data interoperability: Cross-chain protocols can exchange data between blockchains in distinct virtual worlds, easing user migration across them.
  • Data integrity: Blockchain immutability preserves metaverse data across chain copies and prevents alteration or removal without majority consent.
  • Financial system: Blockchain supports a large-scale metaverse financial system through tamper-proofing, openness, transparency, and decentralization.These features address the security and efficiency requirements of millions of virtual-world transactions.
  • Smart contract deployment: Smart contracts enable automated, programmable, open, transparent, and verifiable on-chain interactions without third-party verification.
  • NFTs: NFTs represent unique and indivisible virtual assets and indicate ownership through blockchain-based certificates.

III. BLOCKCHAIN FOR THE METAVERSE: TECHNICAL PERSPECTIVE

The paper surveys blockchain-based methods for metaverse data acquisition and related technical concerns, emphasizing authentication, validation, integrity, and scalability limitations.

  • Technical perspectives: The technical survey covers data acquisition, storage, sharing, interoperability, and privacy preservation in the metaverse.Figure 3 illustrates blockchain for these technical aspects.
  • Data acquisition: Metaverse data acquisition includes payment details, biometrics, poses, and gestures used to create avatars and train AI/ML algorithms.
  • Data acquisition: Web forms, bots, and high-definition cameras can collect authentication elements and physical attributes for digital representations.
  • Data acquisition: Decentralized applications generate huge, unstructured, real-time data, making acquisition and data integrity challenging.
  • Blockchain support: Blockchain supports authentic data acquisition by validating transaction records, tracing data, and requiring majority-node approval for changes.
  • Limitations: Blockchain data acquisition remains constrained by slow transactions, higher fees, limited users, and increasing storage demand.The distributed ledger’s complexity and chain-wide data copying contribute to these constraints.

B. Data Storage

The metaverse will generate massive, continuously growing datasets, creating storage, organization, reliability, and availability challenges. Blockchain offers replicated, transparent, and tamper-resistant storage, but introduces latency and fork-related concerns.

  • B. Data Storage: Massive and continuously growing user-generated data will strain metaverse storage capacity.Social interactions create expanding data files, while data labeling and organization add further challenges.
  • B. Data Storage: Centralized storage risks data loss and corruption for sensitive metaverse data, including biometric data, vocal inflections, and vital signs.
  • B. Data Storage: Blockchain stores replicated transaction blocks throughout the chain, improving tamper resistance, reliability, transparency, and availability.The distributed ledger backs up data across blocks and supports collaborative data labeling and organization.
  • B. Data Storage: Blockchain storage requires every data addition to be mirrored across the chain, creating latency and leaving hard forks as a concern.
  • B. Data Storage: Data sharing across a common metaverse platform can improve collaboration and support personalized systems using AR/VR and IoT data.

2) Challenges of Data Sharing in metaverse:

Metaverse data sharing must protect sensitive information while supporting scalable, transparent exchange across applications and virtual worlds. Blockchain can improve transaction transparency and interoperability, but replication increases delay, resource demands, and costs.

  • 2) Challenges of Data Sharing in metaverse:: Centralized data exchange exposes sensitive information, while mutable data creates high latency, lower availability, and scaling challenges.
  • 2) Challenges of Data Sharing in metaverse:: Blockchain creates decentralized, immutable transaction records that improve transparency for metaverse governance, finance, education, and crypto-exchange applications.
  • 2) Challenges of Data Sharing in metaverse:: Blockchain replication improves data flexibility and adaptability but increases transfer delay as information is copied along the chain.
  • 2) Challenges of Data Sharing in metaverse:: Growing metaverse participation requires more blocks and computing resources, raising validation costs and motivating future-generation blockchain improvements.
  • 2) Challenges of Data Sharing in metaverse:: Traditional virtual worlds restrict transfer of accounts, avatars, NFTs, and other possessions because their platforms are disjointed and unorganized.
  • 2) Challenges of Data Sharing in metaverse:: Cross-chain protocols can exchange avatars, NFTs, and payments between virtual worlds without intermediaries.

4) Summary:

Blockchain is presented as a means to address metaverse interoperability, privacy, and security challenges while supporting participation in social and economic activities. However, cross-chain incompatibilities, key loss, vulnerable applications, and unresolved research needs constrain adoption.

  • 4) Summary:: Cross-blockchain interoperability remains difficult because virtual worlds use different languages, smart-contract capabilities, transaction architectures, and consensus processes.
  • 4) Summary:: The metaverse must address user deception and personal identifiable information risks during early ecosystem adaptation.
  • 4) Summary:: Blockchain-based metaverse privacy systems let users control data access through private and public keys and regulate third-party access.
  • 4) Summary:: Losing a private key can compromise blockchain security and metaverse data privacy.
  • 4) Summary:: Attackers can target third-party applications with inadequate security mechanisms, compromising personal information.
  • 4) Summary:: Blockchain can enhance key-enabling metaverse technologies and support participation in social and economic activities without fear of repercussions.

1) Introduction:

Metaverse applications depend on IoT devices and digital twins, but large-scale real-time data creates storage, security, quality, and interoperability challenges. Blockchain supports cross-world sharing, tamper-resistant records, secure storage, and digital-twin synchronization, while introducing processing and governance concerns.

  • 1) Introduction:: IoT devices connect the metaverse to physical and virtual environments, supporting applications in medicine, education, and smart cities.
  • 1) Introduction:: Large numbers of connected IoT sensors create storage, security, real-time analysis, data-quality, and centralized-management challenges.
  • 1) Introduction:: Blockchain enables IoT devices to share data across cross-chain networks and produce tamper-resistant transaction records without centralized control.Transactions are recorded and authenticated, and IoT-enabled blockchain supports real-time data storage.
  • 1) Introduction:: Blockchain-based IoT systems require substantial processing power and remain vulnerable to miner concentration and unverifiable private data.
  • 1) Introduction:: Digital twins represent metaverse assets, products, and surroundings while synchronizing with the physical world through two-way IoT connections.
  • 1) Introduction:: Digital-twin accuracy depends on genuine, high-quality sensor data, and twins should interoperate across virtual worlds and domains.

3) How blockchain can help:

Blockchain is presented as a mechanism for securing digital-twin and AI-related data in the metaverse through shared ledgers, encryption, ownership control, and privacy-preserving verification.

  • Digital twins: Blockchain-based digital twins can resist attacks and securely share data across virtual worlds through an intelligent distributed ledger.Real-world objects are stored on blockchain and synchronized with their digital twins.
  • Digital twins: A shared distributed ledger helps stakeholders manage digital-twin data while addressing trust, integrity, and safety concerns.The passage identifies standardization, privacy, and scalability as remaining implementation issues.
  • Digital twins: Blockchain, XAI, and federated learning are proposed together to improve the quality of metaverse digital twins.
  • Artificial intelligence: AI-generated avatars create ownership and authenticity challenges, including uncertainty about whether users interact with people or computer-generated agents.AI technologies may also be used to exploit metaverse resources illegally.
  • Artificial intelligence: Blockchain encryption gives users control over their data and supports transferring AI consent, while zero-knowledge proofs verify information without disclosure.This supports authorized use of data for AI model training.

4) Summary:

The metaverse’s expanding, heterogeneous data creates storage, curation, and processing challenges. Blockchain is described as improving data trust and control, but integration remains costly and technically difficult.

  • Big-data challenges: Metaverse data is increasingly large, fast-moving, and heterogeneous, making storage, curation, organization, and technological adaptation difficult.Data scientists may spend most of their time preparing and organizing datasets for stakeholders.
  • Blockchain support: Blockchain can collect data from trusted sources, restrict third-party manipulation, and give owners control over their data.Its immutability and replication across the network are presented as improving data availability and quality.
  • Blockchain support: Blockchain-based collaboration can reduce the time and expense of data cleaning and dataset creation while lowering contamination risk.
  • Open challenges: Blockchain adoption still faces consensus, mining-cost, transaction-verification, system-replacement, and migration challenges.The paper characterizes metaverse integration as being in its early stages.

2) Challenges related to Multi-sensory XR Applications, Holographic Telepresence in the Metaverse:

Multi-sensory XR and holographic telepresence improve immersive representation but raise privacy, data-storage, reach, and deep-fake concerns. Blockchain is proposed for validation, tracing, secure sharing, interoperability, and metaverse services.

  • Challenges: XR recommendation systems can rely on behavioral data from multiple sources, creating personal and societal concerns and substantial storage requirements.
  • Blockchain support: Blockchain ledgers can validate XR records, trace erroneous data, and support more accurate recommendation systems.
  • Blockchain support: Zero-trust and cross-chain mechanisms can help XR and holographic-telepresence applications share data securely between virtual worlds.
  • Applications: Combining multi-sensory XR, holographic telepresence, and blockchain can integrate digital economies into unified platforms.The paper links this integration to more efficient and unambiguous management of metaverse assets and payments.
  • Cross-cutting impact: Blockchain is described as supporting authentic data acquisition, secure big-data handling, interoperability, privacy, auditing, authentication, anti-tampering, and access control across enabling technologies.
  • Metaverse projects: Decentraland, Sandbox, Axie Infinity, and Illuvium illustrate blockchain-based metaverse projects spanning virtual real estate, gaming, trading, and other services.
  • Metaverse projects: Illuvium combines open-world exploration and player-versus-player battles, with each Illuvial represented by a tradable NFT.Its ILV token supports rewards, vault distribution, and DAO governance, while Immutable X provides NFT scalability with zero gas fees.

VI. CONCLUSION AND RESEARCH DIRECTIONS

The paper surveys blockchain’s roles and impacts across metaverse technologies and use cases, concluding that it has substantial potential while identifying consensus, interoperability, and governance directions for future work.

  • Conclusion: The survey analyzes blockchain’s roles and impacts in metaverse foundations, applications, services, technical aspects, use cases, challenges, and future improvements.
  • Conclusion: Blockchain is reported to have strong potential for immersive metaverse applications and services, motivating further research on consensus, network management, and interoperability.
  • Consensus: Security, scalability, and decentralization cannot currently be achieved concurrently by the surveyed consensus mechanisms.The paper proposes investigating hybrid consensus algorithms and lower-energy protocols.
  • Interoperability: Cross-chain systems are presented as a way to execute value and information transfers between different blockchain networks.Omni-chain platforms are identified as a longer-term direction for interacting with varied enterprise networks.
  • Governance: DAOs could automatically develop and maintain metaverse services and products through smart contracts and consensus rules governing major functionalities.
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