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Dibran Mulder
CTO @ Caesar Groep
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Post-mortem of the 7th of Januari

· 3 min read
Dibran Mulder
CTO @ Caesar Groep

According to our mission, we are committed to transparency and accountability. This post-mortem is part of that commitment, detailing the events surrounding the outage of the 7th of January 2026.

Summary of the impact

We experienced significant degradated user experience on the 7th of January 2026, which affected our services for approximately 4 hours. During this time, users experienced inconsistent success rates in onboarding the Yivi app and or issuing credentials to them. The issue was caused by key rotation of the Yivi scheme and successive issues which arose from rotating the key.

24th of September: Release of Trusted Verifier

· 3 min read
Dibran Mulder
CTO @ Caesar Groep

We are announcing the release of the Trusted Verifier on the 24th of September!

Trusted Verifiers marks a crucial step forward in our mission to enhance the security and reliability of digital identity verification within the Yivi ecosystem. It also secures the long term sustainability of the Yivi project.

UX challenges of a crypto agile wallet

· 10 min read
Dibran Mulder
CTO @ Caesar Groep

Our mission is to make Yivi the most privacy and user friendly wallet out there. In line with this mission we developed our crypto agile vision, allowing users to use different cryptographic technologies in a seamless way. As part of this vision, we want to support verifiable credentials, which are becoming increasingly popular in the digital identity space.

Post-mortem of the June 29th and 30th 2025 incident

· 6 min read
Dibran Mulder
CTO @ Caesar Groep

According to our mission, we are committed to transparency and accountability. This post-mortem is part of that commitment, detailing the events surrounding the issue with the Yivi app on iOS on June 29th and 30th 2025.

Summary of the impact

Some iOS users of the Yivi app were unable to open their Yivi app on June 29th and 30th, 2025, due to an issue with the Universal Links feature. This issue was caused by a domain migration of irma.app, resulting traffic to be redirected from irma.app to yivi.app. iOS devices however do not support redirection for Universal Links, which led to the app being unable to open Universal Links. This issue was resolved by changing the irma.app domain back to its original server.

Users that had the Yivi app installed prior to the incident were probably not affected, as the app was still able to open. However, users who installed the app after the domain migration were unable to open it due to the Universal Links issue.

Post-mortem of the 1st of July outage

· 6 min read
Dibran Mulder
CTO @ Caesar Groep

According to our mission, we are committed to transparency and accountability. This post-mortem is part of that commitment, detailing the events surrounding the outage of the 1st of July 2025.

Summary of the impact

We experienced a significant outage on the 1st of July 2025, which affected our services for approximately 6 hours. During this time, users were unable to validate their pincodes and access their Yivi App, making the Yivi-App unusable. The issue was caused by an outage in the Scaleway data center AMS-1, where our database server is located. Scaleway preemptively shut down several services in the datacenter to prevent further issues such as hardware damage due to abnormal temperatures.

Age Verification in the EU, Ambitious goals, missed privacy opportunities

· 15 min read
Dibran Mulder
CTO @ Caesar Groep

Protecting minors, today and tomorrow

The European Commission is preparing a temporary age verification app, aimed at protecting minors on platforms where a minimum age is required—think of online pornography, gambling, alcohol sales, and certain social media services. In a digital world, it's legitimate to shield minors from harmful content. The Digital Services Act (DSA) already obligates large platforms to take protective measures, and the Commission is stepping in where compliance is lacking. A technical solution to verify age online is therefore urgently needed.

Yivi adds an IBAN issuer

· 2 min read
Dibran Mulder
CTO @ Caesar Groep

We’re excited to introduce a new feature in Yivi: IBAN Issuance via verified iDEAL payments. This addition brings secure, self-sovereign proof of bank account ownership right into the hands of Yivi users.

Yivi’s Strategic Roadmap to EUDI-Wallet Compliance

· 9 min read
Dibran Mulder
CTO @ Caesar Groep

As we enter a pivotal phase in digital identity development across Europe, Yivi is committed to becoming a compliant EUDI-wallet. This strategic decision is driven by a broader vision: to ensure that privacy-first identity solutions remain viable in a landscape increasingly shaped by regulation and standardization.

Our mission has always been clear: with Yivi, you are in charge of your digital data. And while regulatory alignment with eIDAS 2.0 and the EUDI-wallet may challenge some of our architectural preferences, it is a necessary step to bring privacy-preserving identity to the masses.