Evixar and Shachihata Partner for Content Integrity with C2PA Authentication（2026-03-13）

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Evixar and Shachihata Partner for Content Integrity with C2PA Authentication（2026-03-13）

Press Release

March 13, 2026

Evixar Inc.

Shachihata Inc.

Japanese

Providing content authentication and provenance certificates with C2PA-compliant acoustic watermarking and fingerprinting technologies

Evixar Inc. and Shachihata Inc. have formed a capital and business alliance to prevent the malicious use of deepfakes—fake images, videos, and audio created by generative AI.
Shachihata will invest in Evixar to support the technological development of its content protection services, which utilize special sounds embedded with encrypted data (audio watermarks) and acoustic feature points (fingerprints) stored in databases. Both companies will provide services compliant with the global origin-proofing standard C2PA and build the information infrastructure for "SIGNED SOUND" (trademark registration pending).

Furthermore, Evixar has been selected for two consecutive years (FY2024 and FY2025) for the Ministry of Internal Affairs and Communications' "Development and Demonstration Project for Countermeasure Technologies against Online Disinformation," and will exhibit at the results dissemination event in Tokyo on March 16.

SIGNED SOUND

Shachihata's Planned Content Origin Certificate: "SIGNED SOUND"

Shachihata plans to subscribe to Evixar's third-party allotment of shares, investing 110.55 million yen in mid-March. This will give Shachihata a 6.58% stake, making it the third-largest shareholder. Shachihata will encourage client companies to adopt the content protection service, leveraging its expanding digital trust business, which has surpassed 1.1 million implementations of its Shachihata Cloud electronic seal, approval, and contract system. Backed by this track record, Shachihata will receive C2PA certification and issue the "SIGNED SOUND" origin certificate. Obtaining the international standard "ISO/IEC27001" for solution management and operation for Shachihata Cloud will also be advantageous.

Meanwhile, Evixar will accelerate development with specifications compliant with C2PA. The company has already distributed seven of the Kyoto Prefectural Governor's press conferences on YouTube between October and November 2025, embedding acoustic watermark information indicating "Kyoto Prefecture Official" with the prefecture's cooperation. This demonstration confirmed the practicality of introducing a reliable system for official information without heavily burdening daily administrative tasks. Evixar is also beginning partnership discussions with major Taiwanese telecommunications carrier ChungHwa Telecom to jointly verify the technical challenges and effectiveness of applying real-time audio watermarking technology as an anti-fraud measure on international communication infrastructures. Furthermore, they have demonstrated effectiveness in a test environment for content distributed on the IP radio service "radiko," proposing benefits for improving broadcast reliability and protecting creators' rights.

How the Content Protection Service Works
In Evixar's system, users register and log in to a web-based platform. When video data is uploaded, the system embeds an electronic watermark into the audio and generates acoustic fingerprint data from it. The watermarked material can then be downloaded and distributed across various media.
If a suspicious video becomes a trending topic on social networking services (SNS), it can be downloaded and uploaded to the system for watermark detection and fingerprint matching. If neither the watermark nor the fingerprint matches, it can be identified as a video generated by AI. (Evixar's technology is also utilized in barrier-free cinema screenings, such as "HELLO! MOVIE" and "Subtitle Glasses".)

Track Record in Other Fields

Cross-film-industry operation of a standardized acoustic fingerprint (audio feature point) database and accessibility services ("HELLO! MOVIE", "Subtitle Glasses") in Japan.

HELLOMOVIE_BLACK

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(The above infographic was created by AI)