What is DID (Decentralized ID)? Latest Developments and Applications

What Is DID (Decentralized ID)?

DID (Decentralized ID) is an innovative system that allows individuals to manage their own identity information using blockchain technology. Its core feature is decentralized ID management through blockchain, unlike traditional ID systems that rely on a central authority. With DID, users hold direct ownership and control of their information, aiming to return ID ownership to individuals and organizations.

DID enables users to manage their digital identity and share information with third parties as needed, protecting personal data and ID rights. This technology is expected to be used in various areas, such as personal information management and identity verification.

In Japan, progress toward practical adoption is accelerating. Eight major companies—including Mitsubishi UFJ Trust and Banking, NTT Data, and Itochu Techno-Solutions—have formed a consortium to pursue DID applications. Blockchain technology used in DID aligns well with public institutions and Japan’s Web3 and digital transformation initiatives, making widespread adoption likely. As standardization and usability improve, DID usage is expected to expand further.

Key Features of DID

DID (Decentralized ID) has unique features not found in traditional ID systems. Here are three main features of DID.

1. Complete Control Over Your ID

DID gives users full control over their identity. Unlike traditional IDs managed by companies or government agencies, DID allows users to own and control their data. Users decide how their personal information is used and with whom it is shared. This self-sovereign approach is vital for privacy protection.

2. High Security

Blockchain technology encrypts data and records it on a distributed ledger, making tampering extremely difficult. Traditional centralized databases risked massive data leaks if breached, but DID’s distributed management greatly reduces these risks. Public key cryptography further enhances verification accuracy and protects against fraud such as impersonation and ID theft.

3. Usability and Interoperability

DID offers seamless use across different services. Once issued, a DID can be used for login and identity verification on multiple platforms, including online banking, social networks, and e-commerce sites. Users no longer need to manage multiple IDs and passwords, greatly improving user experience and digital convenience.

Benefits of DID (Decentralized ID)

DID (Decentralized ID) offers significant advantages over traditional ID systems. Here are three key benefits.

Benefit 1: Enhanced Security and Privacy

Traditional ID systems used weak authentication methods like passwords, exposing accounts to theft and takeover risks. Companies could also collect and use user data for targeted advertising, creating privacy concerns.

DID uses blockchain to encrypt personal information and store it on a distributed ledger, greatly reducing unauthorized access risks and strengthening security and privacy. Users can control how much information they disclose, sharing only what is necessary. This “selective disclosure” function further reinforces privacy protection.

Benefit 2: User Self-Management

With traditional IDs, companies managed user data, depriving users of full control. If a company ended a service or its database was attacked, users could lose access to their information.

With DID, users fully control their identity data. DID does not depend on centralized issuers; users can manage and share their information with third parties as needed, making the system more decentralized and democratic. This self-sovereign approach matches Web3 principles and is key for user empowerment.

Benefit 3: Internet Interoperability

Traditional ID systems required different IDs for each service, causing users to manage multiple credentials—a heavy burden.

DID is compatible with other identification methods and can integrate with legacy systems. It enables interoperability across platforms, letting users use the same DID for multiple services. This improves interoperability and allows seamless digital experiences, such as reusing verified identity information without redundant data entry.

Drawbacks of DID (Decentralized ID)

While DID (Decentralized ID) has many advantages, it also presents challenges. Here are two main drawbacks.

Drawback 1: System Complexity

DID uses blockchain and differs greatly from traditional IDs, making it complex. Users must understand concepts like public keys, private keys, and DID documents to issue, manage, and use DIDs. These may be unfamiliar and take time to learn.

Managing private keys is especially important—losing one can mean losing access to your DID. While traditional systems offer password resets, recovering a lost private key with DID is often difficult, creating risk for users.

Poor usability could hinder DID adoption. For Web3 services to gain traction, UI/UX needs to be intuitive for all users. Hiding technical details and providing simple, user-friendly interfaces is essential for broad adoption.

Drawback 2: Limited Interoperability

DID is still evolving, and unified standards are not yet fully established, making interoperability between services difficult. Multiple DID standards exist, each with different specifications and implementations, creating compatibility issues.

Users may need different DIDs for different services, reducing the benefit of interoperability. Service providers face higher costs as they must develop their own DID integrations.

Standardization and technology improvements are expected to resolve compatibility issues in the future, but for now, usability challenges remain. Industry-wide efforts toward standardization and protocol development are vital for DID adoption.

Latest Developments and Use Cases for DID (Decentralized ID)

DID (Decentralized ID) is being adopted in various sectors worldwide. Here are some recent updates and specific examples from Japan and abroad.

Use Case 1: Japanese Companies Establish the “DID/VC Co-Creation Consortium”

Eight leading Japanese firms—Mitsubishi UFJ Trust and Banking, NTT Data, Itochu Techno-Solutions, TOPPAN Digital, Hakuhodo Key3, Hitachi, Fujitsu, and Anderson Mōri & Tomotsune—have created the “DID/VC Co-Creation Consortium” (DVCC) to co-develop business opportunities using DIDs and verifiable credentials (VCs).

This consortium aims to build an environment where a single ID works across multiple online services, increasing user convenience. VCs connected with DIDs provide secure, simple identity and qualification verification to help solve social challenges.

DVCC focuses on four main areas: 1) Business co-creation—developing new services and models; 2) Rule development—creating legal and technical guidelines for DID and VC; 3) Shared resource use—building shared infrastructure for efficient operations; and 4) External collaboration—working with government and industry groups to promote DID adoption.

Use Case 2: TicketMe Uses DID to Address Ticket Scalping

TicketMe, Japan’s first NFT ticket platform, has partnered with Digital Platformer Co., Ltd.—which provides DID services using the My Number Card—to combat ticket scalping.

Ticket scalping has long plagued the industry. Traditional identity verification required collecting large amounts of personal information, raising privacy concerns.

Through this partnership, TicketMe added the “SHIKI” DID issuance service, allowing easy, reliable identity verification while protecting privacy. Users issue a DID with their My Number Card and use it to buy tickets, completing identity verification. This prevents unauthorized sales and protects privacy.

Use Case 3: China Launches National DID System “RealDID”

China’s Blockchain Service Network (BSN) introduced “RealDID,” a blockchain-based ID system, as part of the “Digital China” project. RealDID is a large-scale, national DID initiative.

With RealDID, users manage their own digital ID and data. Chinese citizens can register and log into websites anonymously, protecting privacy while accessing online services.

RealDID is designed for e-government, financial transactions, medical record management, educational certification, and more. China aims to build digital infrastructure for greater convenience and security, making this a leading national DID example.

Use Case 4: Worldcoin’s DID Supported in World ID 2.0

Worldcoin, led by OpenAI CEO Sam Altman, launched “World ID 2.0,” an advanced DID system combining biometrics and blockchain.

This update strengthens the user ID system, making Worldcoin’s DID available on major platforms like Reddit, Telegram, Minecraft, and Shopify. Users can log in securely and easily with World ID.

Developers can also integrate “Sign in with World ID” into their apps and sites, providing safer, more convenient authentication options.

World ID 2.0 is positioned as the “human passport for the internet,” supporting online identity and age verification, anti-bot measures, and more. As AI increases the risk of disinformation and impersonation, World ID’s role will become even more critical.

Summary: DID (Decentralized ID) Is Set for Broad Adoption in Japan

DID (Decentralized ID) is a blockchain-based ID management system providing enhanced security, privacy, user control, and interoperability. However, technical complexity and compatibility challenges must be addressed for widespread use.

DID use cases are growing worldwide as companies, governments, and organizations explore its potential. In Japan, large companies are forming consortia and integrating DID into business, accelerating adoption.

As technology advances, DID will likely become widely used. While still developing, DID makes managing personal data easier and more secure, with the potential to become critical digital infrastructure. Progress in standardization, UI/UX, and legal frameworks will make DID accessible and convenient, supporting a safer digital life.

FAQ

What is DID (Decentralized ID)? How does it differ from traditional ID management?

DID is a digital identifier that individuals fully control. Unlike centralized IDs, DID is managed on the blockchain, independent of governments and companies, reducing breach risks and improving privacy and authentication convenience.

What are the main use cases for DID?

Main DID use cases include digital identity verification, document authentication, process acceleration, and cost reduction. It is used in medical record management, educational credentialing, and financial services onboarding.

What are the advantages and disadvantages of DID?

Advantages: reduced data breach risk, authentication with minimal information disclosure, simplified ID management. Disadvantages: difficult key recovery if lost, slow standardization, limited interoperability, user responsibility for management.

How does DID ensure security? What privacy mechanisms are used?

DID uses encryption and decentralized data management for security. Users control their identity and data sharing, removing central reliance and enhancing privacy.

What is blockchain’s role in DID implementation?

Blockchain enables decentralized ID creation, management, and verification. It cuts out central authorities, ensures transparent, tamper-proof identity, and gives users full data control.

What are the latest trends and future outlook for DID?

DID adoption is accelerating in enterprises and government. Europe is advancing with ESSIF, Asia sees more pilots. As interoperability and social recovery features are standardized, key management risks decrease. Integration with Web3 and DeFi will further growth, with DID likely becoming mainstream within five years.

What challenges do companies and organizations face in adopting DID?

Challenges include private key management, user responsibility, interoperability across DID methods, and slow standardization. Integration with existing systems and strong security operations are also needed.

What is the relationship between DID and Self-Sovereign Identity (SSI)?

DID is the foundation for Self-Sovereign Identity (SSI), letting users control their digital identity without central authorities. Combining DID with verifiable credentials (VCs) enables SSI.