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Shachihata Co., Ltd. and Evixar Co., Ltd. will begin offering the official version of “SIGNED SOUND” (trademark application pending), a service that enables the recording and verification of the provenance (provenance here refers to the results of comparison with the registered original and the recorded provenance information. It does not guarantee the truthfulness of the content, the authority of the sender, or the legal authenticity) of audio and video content, starting July 7, 2026.
SIGNED SOUND aims to enable content distributors to leave a “mark” of their provenance on their legitimate content, allowing viewers and secondary distributors to compare it with the original source at any time. Provenance information, such as “recorded signatory, signing time, and correspondence with the original,” provides distributors with a solid foundation for confidently delivering legitimate content.
This service was realized as an initiative based on the capital and business alliance announced by both companies on March 13, 2026. Shachihata will be responsible for issuing the certificate of authenticity and operating the platform, while Evixar will provide the acoustic identification technology. Inquiries and applications for this service can be made through the contact information at the end of this release.
Background: Risks associated with an information space lacking historical records.
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The speed at which information spreads via social media far exceeds the speed at which the source denies or corrects the information. In the January 2024 Noto Peninsula earthquake, it was estimated that approximately 104 out of about 1,100 rescue requests posted within 24 hours of the earthquake (about 10%) were false information, and there have been cases of arrests on suspicion of fraudulent obstruction of business (Ministry of Internal Affairs and Communications, 2024 Information and Communications White Paper).
Furthermore, on April 1, 2025, the “Information Distribution Platform Countermeasures Act” (an amendment to the former Provider Liability Limitation Act) came into effect, requiring designated large-scale platform operators to take measures to expedite responses to infringing information and to increase transparency in their operations. It should be noted that this Act does not obligate content creators to prove the origin or authenticity of their content. These changes in the legal environment reflect a growing social concern about how information is distributed.
In response to this situation, research has pointed out the limitations of generalization in AI detection technology for speech synthesis and video generation, where accuracy decreases due to methods outside the training scope and re-encoding processes via social media. There are situations where the approach of “detecting suspicious content after the fact” is no longer sufficient, and the need for a provenance recording approach, where the source of the original content is recorded in advance, is increasing. SIGNED SOUND responds to this challenge with a combination of acoustic technology and provenance metadata standards.
SOURCE: PRTimes
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