Iizuka City DID/VC Disaster Prevention Demonstration Experiment Report Page
- Message for the start of the demonstration experiment - Starting from Iizuka City, what will be "commonplace" in five years
- 01. Project overview and timeline
- 02. DID/VC Demonstration Experiments - Three World-First Demonstration Patterns
- 03. "Thinking about Disaster Prevention" - Surviving the Unexpected by Asking Questions with No Correct Answers
-04. The strongest three-company alliance team
Starting with Iizuka City, we will create what will be the norm five years from now
A world first and a local government first──Disaster prevention x DID/VC to create a society where "no one is left behind"
It took 30 years for the Internet to become a part of social infrastructure. From a time when people thought it was rude to email and that online shopping was unthinkable, to today's world where everyone uses it as a matter of course.
Blockchain is the evolution of the internet.
"Own your own information"
It sounds obvious when you put it into words, but in the world of the Internet, this has not been possible. Blockchain technology is finally breaking through that barrier.
However, this is an area that no one has yet experienced. What will a society where people manage their own information look like? How will conventional wisdom and systems change? No one will know until they try it.
That is why this proof-of-concept experiment is so valuable. We will walk where there is no path, and a path will appear after we walk. We will take the first step in Iizuka City, the first city in Japan to declare its support for blockchain.
The certificate obtained while learning about disaster prevention will serve as evacuation shelter certification in the event of a disaster. "One certificate, two values" that connects peacetime and emergencies.
"Leaving no one behind" does not mean forcing everyone to use digital technology. Those who are skilled in technology support those who are not, and this dialogue creates connections in the community. The technology does not need to be visible. It is the interaction between people that will protect lives.
The issues that emerge here are not unique to Iizuka City. They are anticipatory questions that Japan and the world will inevitably face in the future. We will use this knowledge to make policy recommendations, design systems, and develop standards for the next era.
Don't wait for the future, create it. That first step begins here.
01. Project overview and timeline
Iizuka City, Japan's first city to declare its support for blockchain, is about to begin a demonstration experiment of the world's first disaster prevention system utilizing DID/VC (Decentralized ID/Verifiable Certificate).
Implementation period : December 2025 to March 2026
Approximately 30 participants per pattern (see section 02 for details)
Support Project: Iizuka City Advanced Information Technology Demonstration Experiment Support Project Selected Project
Demonstration experiment timeline (4 steps)
Step 1 December 23, 2025
FBA2025 Event @Iizuka City Hall [1st Demonstration Experiment]
The demonstration experiment was announced at the Fukuoka Blockchain Alliance event.
A shelter reception simulation was conducted.
Step 2: Early January 2026 to early March 2026
Disaster prevention quiz distribution for 8 weeks, total of 56 questions
The survey will be distributed every Monday in the LINE group. We ask that you find time to respond at some point during the week.
Step 3: February 17, 2026
Shibuya Web3 University 3rd Anniversary Event @ Shibuya Web3 University
An interim report will be presented, reporting on the progress of the demonstration experiment.
Step 4: March 20, 2026
Iizuka City 20th Anniversary Ceremony [Second Demonstration Experiment]
We will present a shelter reception simulation and a report on the final stage of this demonstration experiment.
02. DID/VC Demonstration Experiments - Three World-First Demonstration Patterns
What is DID/VC?
At evacuation shelters, people have to write their names and addresses multiple times, show their ID, and in the chaos of a disaster, these procedures take time.
DID/VC (Decentralized ID/Verifiable Certificate) is a technology that solves this problem. Identity verification can be completed simply by showing the QR code of the certificate stored on a smartphone. This is the future we are working to realize.
On the traditional Internet, personal information could only be stored on corporate or government servers. With DID/VC, you can hold your own information and provide it of your own volition when needed. This is a new form of personal information management that has not been possible until now.
However, currently, very few people have experience with DID/VC. Even those who have experience with it have accepted that it is "difficult to use" and "difficult to understand" as a given. Most people who have not experienced it are either unaware of its existence or distance themselves from it, viewing it as "suspicious."
This is the same situation that emerged when the internet, email, and smartphones first appeared. That's why it's so valuable to be the first to take on the challenge.
Basic structure of the issuance flow
There are three main actors in DID/VC:
1. Issuer: The entity that issues the certificate.
2. Holder: An individual who receives and manages a certificate.
3. Verifier: A third party that verifies the authenticity of the certificate
The important thing is that these three are all different entities. The issuer does not hold the holder's information; after issuance, it is managed solely by the holder. The verifier can only verify the information that the holder willingly presents.
In this proof-of-concept experiment, Shibuya Web3 University Co., Ltd. will issue the certificates on behalf of Iizuka City Hall through the Turing Certs platform, instead of the original issuing body. This will also be subject to verification as an outsourcing model for local governments when issuing DIDs/VCs.
Pattern 1: Event-linked issuance
Event participation certificate + Shelter demonstration (IOTA / public chain)
[Target] Participants in the FBA2025 (Fukuoka Blockchain Alliance 2025) event on December 23, 2025 (approximately 30 people)
[Certificate meaning] In normal times: Commemorative certificate for participating in the FBA2025 event In times of emergency: Used for identity verification and evacuee management at evacuation shelter reception
[Timing of issue] Issued by email before the event, and verified immediately by scanning the QR code on the day
[Demonstration site] December 23, 2025 FBA2025 @ Evacuation shelter reception simulation at Iizuka City Hall
[Technology Platform] IOTA (Public Chain) / Turing Certs Platform Issuer: Shibuya Web3 University Co., Ltd.
Pattern 2: Continuous learning
Quiz participation certificate + 8-week quiz completion certificate + Refuge demonstration (IOTA / public chain)
[Target] Those who complete the 8-week quiz program and can participate in the Iizuka City 20th anniversary ceremony on March 20th (approximately 30 people)
[Certificate meaning] In normal times: Proof that you have completed the 56-question continuous learning course. In times of emergency: Used for identity verification and evacuee management at evacuation shelter reception.
[Issuance timing] Issued twice in early January when participating in the quiz and by email in mid-March to those who complete the quiz
[Demonstration site] Simulation of evacuation shelter reception at the Iizuka City 20th anniversary ceremony on March 20, 2026
[Technology Platform] IOTA (Public Chain) / Turing Certs Platform Issuer: Shibuya Web3 University Co., Ltd.
Pattern 3: Consortium chain type
Ceremony participation certificate + evacuation shelter demonstration (Toshiba / Consortium Chain)
[Target audience] Participants in the Iizuka City 20th Anniversary Ceremony on March 20, 2026 (approximately 30 people)
[Meaning of the certificate] In normal times: Commemorative certificate for participation in the Iizuka City 20th anniversary ceremony In times of emergency: Used for identity verification and evacuee management at evacuation shelter reception
[Timing of issue] Issued by email before the event, and verified immediately by scanning the QR code on the day
[Demonstration site] Simulation of evacuation shelter reception at the Iizuka City 20th anniversary ceremony on March 20, 2026
[Technology Platform] Toshiba (Consortium Chain) / Turing Certs Platform Issuer: Shibuya Web3 University Co., Ltd.
What this demonstration experiment will reveal
No one has yet verified the entire process from issuing DID/VC to authentication in an actual disaster prevention simulation.
In this project, we will actually run the entire process of issuing, receiving, displaying, and authenticating DID/VC in the life-threatening field of disaster prevention, and clarify what works and what issues remain. This is the first time that DID/VC has been demonstrated in the field of disaster prevention, in Japan, the world, and by a local government.
The data obtained here will provide valuable insights that will not only improve technology, but also provide recommendations for system design and regulatory reform, and serve as a bridge for comparative verification with future My Number cards.
There are issues that become apparent only by trying something new. The mission of this demonstration experiment is to transparently disclose the results, both successes and failures, and use them as a guidepost for the next challengers.
Identifying issues throughout the DID/VC supply chain
Technical and operational challenges in the issuance process
Participant barriers and confusion in the receiving process
Problems with operability and visibility in the display process
Practicalities and limitations of the authentication and verification process
Verification of the local government issuing model
Possibility of outsourcing when local governments become issuers
Issues regarding consistency with current regulations and legal status
Basic data for future comparative verification with My Number Cards
Security design hypothesis verification
The validity of the "design that does not create an incentive to falsify" hypothesis
The potential application of blockchain technology (designed to reward correct actions) to the field of disaster prevention
Clarifying these issues will accelerate research and development of DID/VC and pave the way for its implementation in society.
Security Hypothesis Verification Survey
The uniqueness of this proof-of-concept experiment lies in the verification of the blockchain design concept itself.
Satoshi Nakamoto, the creator of Bitcoin, has a design principle: "Fraud leads to losses, while righteous behavior leads to gains." This mechanism creates an environment in which malicious behavior itself is less likely to occur. The same principle may also apply to DID/VC for disaster prevention purposes. If there is no benefit to be gained from tampering, there is no motivation to attempt tampering. This hypothesis will be tested through the thought processes of the participants.
Security Hypothesis Verification Questionnaire
The uniqueness of this demonstration experiment lies in verifying the design philosophy of blockchain itself.
Satoshi Nakamoto's design that created Bitcoin has a certain principle: "Cheating leads to loss, while honest behavior leads to gain." This mechanism creates an environment where malicious actions are inherently unlikely to occur.
We hypothesize that the same principle applies to DID/VC for disaster prevention purposes. If there is no benefit to be gained from tampering, the motivation to attempt tampering itself does not arise. We will verify this hypothesis through participants' thought processes.
Questionnaire Design
[To be conducted after the demonstration experiment ends]
Section 1: Basic Information
Q1. Please select the pattern you participated in:
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Pattern 1 (FBA2025 Event Participation Certificate + Evacuation Shelter Demonstration)
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Pattern 2 (8-Week Quiz Participation Certificate + Quiz Completion Certificate + Evacuation Shelter Demonstration)
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Pattern 3 (City 20th Anniversary Ceremony Participation Certificate + Evacuation Shelter Demonstration)
Q2. Please select your age group:
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Teens / 20s / 30s / 40s / 50s / 60s / 70s or older
Q3. Was this your first time experiencing DID/VC?
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First time / Already knew about it / Already been using it
Section 2: Evaluation of DID/VC Supply Chain Experience
Issuance Process
Q4. Were there any difficulties or confusing aspects in the process of receiving your certificate? (Free response)
Q5. How did you feel when the certificate arrived by email? (Free response)
Display Process
Q6. Were you able to smoothly display the certificate on your smartphone?
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Very smooth / Generally smooth / Somewhat difficult / Very difficult
Q7. If you had any difficulties with the display, please describe them. (Free response)
Verification Process
Q8. Did the QR code scanning at the evacuation shelter reception proceed smoothly?
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Very smooth / Generally smooth / Somewhat difficult / Very difficult
Q9. Comparison of evacuation shelter reception methods: Which method do you think is better for evacuation shelter reception during disasters?
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Handwritten reception (conventional method) / DID/VC authentication reception (digital method) / Cannot say either way / Don't know
Q10. What challenges do you think there would be in implementing DID/VC authentication at evacuation shelters? (Multiple selections allowed)
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Accommodating people without smartphones
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Accommodating elderly and others unfamiliar with the operation
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Securing communication environment and power during disasters
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Concerns about handling personal information
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The hassle of pre-registration
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Handling authentication errors
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No particular challenges felt
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Other:
Q11. If you have any concerns or suggestions for improvement regarding the verification process, please share them. (Free response)
Section 3: Security Hypothesis Verification (Core Section)
Awareness of Tampering Possibilities
Q12. Can you think of a way to "tamper with" the certificate (VC) you obtained?
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Yes, I can / No, I cannot / Don't know
Q13. (For those who answered "Yes, I can" to Q12) What specific methods can you think of? Please share all of them. (Free response) The methods you provide here will be used as valuable data for improving security.
Verification of Tampering Motivation
Q14. If there were a way to tamper with it, would you actually want to do so?
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Yes / No / Don't know
Q15. (Reason for Q14 response) Why do you think so? (Free response)
Q16. Do you think there is anything to be gained by tampering with this disaster prevention certificate?
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Yes / No / Don't know
Q17. (For those who answered "Yes" to Q16) What do you think could be gained? (Free response)
Verification of Impersonation Possibilities
Q18. Can you think of a way to "impersonate" someone using another person's VC?
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Yes, I can / No, I cannot / Don't know
Q19. (For those who answered "Yes, I can" to Q18) What specific methods can you think of? (Free response)
Q20. If impersonation were possible, do you think there would be any benefit to impersonating someone using this disaster prevention certificate?
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Yes / No / Don't know
Q21. (Reason for Q20 response) Why do you think so? (Free response)
Section 4: Understanding of Blockchain Design Philosophy
Q22. What do you think about the "design where cheating yields no benefit"? (Free response)
Q23. Do you think this type of design would be effective in fields other than disaster prevention? In what fields could it be applied? (Free response)
Q24. Has your impression of DID/VC changed through this experience?
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Changed in a positive direction / No change / Changed in a negative direction / Don't know
Q25. (Reason for Q24 response) How has it changed? (Free response)
Section 5: Free Response
Q26. Please freely write any observations, thoughts, or suggestions for improvement from the entire demonstration experiment. (Free response)
03. "Thinking about Disaster Prevention" - Surviving the unexpected by asking questions with no right answers
It's too late after a disaster occurs
We panic and start thinking after an emergency occurs. Then, just when we have forgotten about it, another disaster occurs. To stop this cycle, we need to develop the habit of thinking about it during normal times.
Every Monday, you will receive a 7-question quiz via LINE. Please make time to answer it sometime during the week. The accumulated knowledge over the course of 8 weeks will help you make better decisions when the time comes.
There is no single correct answer
"Should I always go to an evacuation shelter if an evacuation order is issued?"
Both true and false are correct because the answer changes depending on the situation.
Even if you memorize the manual, you cannot deal with the unexpected. The ability to think is the power to survive.
Quiz for Iizuka City
General disaster prevention knowledge is not very effective. This quiz is designed based on the realities of Iizuka City, such as the risk of flooding of the Onga River, past experiences of heavy rain, and the characteristics of the area with few earthquakes.
The 56 questions were completed through a three-way collaboration between Shibuya Web3 University, Thinking Disaster Prevention, and Iizuka City's Disaster Prevention and Safety Division, and will be made available to the public as a permanent disaster prevention education asset for Iizuka City even after the demonstration experiment.
8-week theme
Weekly Theme
1 The essence of disaster prevention: how to deal with the unexpected
2. Ability to assess the situation - balance between information and intuition
3 Deciding whether to evacuate: When in doubt, think carefully
4. Cooperating to Survive: Practical Thinking on Mutual Aid
5. Unseen risks: Imagining earthquakes and complex disasters
6 Surviving after a disaster: Preparation and ingenuity for a long-term battle
7. A new approach to disaster prevention: disaster prevention through DID/VC
8 Iizuka City's 20th Anniversary and Disaster Prevention Vision - Thinking Together, Protecting Together
Disaster Prevention Quiz Archive
Even those who are not participating in the demonstration experiment will be able to view all of the quizzes and explanations. After the quiz begins, it will be updated weekly, and all questions will be made public in late March 2026.
[View Quiz Archive →]
04. The strongest three-company alliance team
Why a three-company alliance?
This world-first challenge required three areas of expertise, none of which would have been possible without one: the ability to deliver cutting-edge technology to society, disaster prevention knowledge that protects lives, and the technological infrastructure to reliably deliver certificates. Only with these three elements could "Disaster Prevention DX that leaves no one behind" be realized.
Shibuya Web3 University Co., Ltd. (Shibuya Web3 University🐣)
Overall supervision, project management, branding, quiz design, quiz creation
A practical community working to implement Web3 technology in society. He is responsible for overall coordination as the liaison with Iizuka City, and leads the UI/UX design that delivers complex technology in an "invisible" way.
・President hajimex🎸
・Assistant: Gekikara-chan 🌶️
・Create Course Member: Satoshi Maeyama (CEO, Maeyama Warehouse Co., Ltd.)
・Craate course member Go Kurimoto (JR Central, Innovation Promotion Office)
・Craete course member Yuhei Goto (JR Central, Innovation Promotion Office)
・Create course member Nguyen Thu Quyn (1BITLAB CEO)
・Create Course Member: Kenya Hasegawa (Representative Director of Risk Finance Institute, Certified Public Accountant and Tax Accountant)
・Create course member Shota Yamanaka (CEO, Delight Inc.)
Thinker Disaster Prevention Co., Ltd.
Supervisor of disaster prevention demonstration experiments and disaster prevention quiz
A community-based disaster prevention consulting company. We design quizzes that foster thinking skills through questions with no correct answer. We provide truly useful disaster prevention education based on Iizuka City's topography, climate, and disaster experience.
・Takagi Toshiyuki (President and CEO)
Turing Japan Co., Ltd.
Blockchain certificate technology and DID/VC system construction
Provides the DID/VC certificate issuance platform "Turing Certs." Has issued over 6 million certificates and collaborates with over 550 issuing organizations. Responsible for technical support for demonstration experiments.
・Mari Ishikawa (President and CEO)
Iizuka City × Shibuya Web3 University × Kangaeru Disaster Prevention Co., Ltd. × Turing Japan Co., Ltd.
Thinking about disaster prevention
This demonstration experiment is being carried out as part of the Iizuka City Advanced Information Technology Demonstration Experiment Support Project for FY2025.