The metaverse gradually evolves into a virtual world containing a series of interconnected sub-metaverses. Diverse digital resources, including identities, contents, services, and supporting data, are key components of the sub-metaverse. Therefore, a Domain Name System (DNS)-like system is necessary for efficient management and resolution. However, the legacy DNS was designed with security vulnerabilities and trust risks due to centralized issues. Blockchain is used to mitigate these concerns due to its decentralized features. Additionally, it supports identity management as a default feature, making it a natural fit for the metaverse. While there are several DNS alternatives based on the blockchain, they either manage only a single type of identifiers or isolate identities from other sorts of identifiers, making it difficult for sub-metaverses to coexist and connect with each other. This paper proposes a Multi-Identifier management and resolution System (MIS) in the metaverse, supporting the registration, resolution, and inter-translation functions. The basic MIS is portrayed as a four-tier architecture on a consortium blockchain due to its manageability, enhanced security, and efficiency properties. On-chain data is lightweight and compressed to save on storage while accelerating reading and writing operations. The resource data is encrypted based on the attributes of the sub-metaverse in the storage tier for privacy protection and access control. For users with decentralization priorities, a modification named EMIS is built on top of Ethereum. Finally, MIS is implemented on two testbeds and is available online as the open-source system. The first testbed consists of 4 physical servers located in the UK and Malaysia while the second is made up of 200 virtual machines (VMs) spread over 26 countries across all 5 continents on Google Cloud.

翻译：元宇宙逐渐演变为包含一系列相互关联的子元宇宙的虚拟世界。各类数字资源（包括身份、内容、服务及支撑数据）构成了子元宇宙的关键组成部分。因此，需要一种类似域名系统（DNS）的机制来实现高效管理与解析。然而，传统DNS因中心化问题存在安全漏洞与信任风险。区块链凭借其去中心化特性可缓解这些问题，且其原生支持身份管理的功能使其天然适配元宇宙场景。尽管已有多种基于区块链的DNS替代方案，但这些方案要么仅管理单一类型的标识符，要么将身份标识与其他标识符隔离，导致子元宇宙难以共存互联。本文提出了一种元宇宙中的多标识符管理与解析系统（MIS），支持注册、解析及跨域互译功能。基于联盟链的可管理性、增强安全性与高效特性，MIS被构建为四层基础架构。通过轻量化压缩链上数据以节省存储空间，并加速读写操作；在存储层，基于子元宇宙属性对资源数据进行加密，实现隐私保护与访问控制。针对偏好去中心化的用户，我们基于以太坊提出了改进版本EMIS。最终，MIS在两个测试平台实现，并作为开源系统在线发布：首个测试平台由位于英国和马来西亚的4台物理服务器组成，第二个测试平台则包含谷歌云上遍布五大洲26个国家的200台虚拟机（VM）。