Digital trust service "Trustee" now available. Prevents vulnerable PDFs from being forged or tampered with by generative AI, and develops a timestamp capable of processing up to 1,000 documents per second

WingArc1st Inc. will launch a digital trust service (*2), Trustee, on 26 August 2025 to ensure the reliability of electronic documents in business-to-business transactions against the backdrop of the rapid evolution of generative AI.

Specifically, we have developed Japan's fastest (*1) and lowest cost Trustee time stamp with 1,000 documents per second in the forms and document management product line, and obtained certification from the Ministry of Internal Affairs and Communications on 8 August 2025 (*3). The price is less than 5 yen per stamp (excluding tax) (*4), and we aim to introduce the product to 1,000 companies in three years.

■Background
The evolution of generative AI technology has made it easier to forge and falsify electronic documents (such as invoices, contracts, national tax-related documents, etc.) between companies and government agencies. 23.6% of respondents to a survey conducted by our company are concerned about the possibility of not being aware of AI falsification of important documents. (*5)

With the revision of the Electronic Books Preservation Act, it has become common practice to assign time stamps at the receiving end of documents. This operation creates a security hole by circulating unprotected PDFs that are at risk of tampering or impersonation between the issuance and receipt of the document. A timestamp assigned by the issuer of an electronic document can provide proof of the existence of the document from the time of issuance and ensure that the document is not tampered with afterwards.

In Europe, the use of AI-generated forged documents by criminal organizations and antisocial forces is becoming increasingly serious, leading to stronger national laws and regulations, and a growing sense of crisis. In Japan, this is one of the future security threats to business, and the trust service market is expected to grow to 55.6 billion yen (*6) by around 2030.

Considering the social risk background of AI technologies, WingArc has decided to develop a new digital trust service to ensure the safety of digital data in its ledger sheet and document management product line, which has held the top market share(*7) for about 30 years. The new service is designed to further reduce the risk of tampering by providing high-speed, low-cost time stamps at the origin of the document.

■Features of Trustee Time Stamping
- Real-time high-speed processing of over 1,000 documents per second
Proprietary PDF analysis technology and an extremely simple design enable high-speed processing of more than 1,000 documents per second. In addition, we have built a mechanism that makes it impossible to issue unauthorized timestamps even if the server is illegally hacked. (Patent pending).

- Multiple locations and redundant configurations support a system that never stops
High availability ensures that no time is lost during periodic maintenance, leap seconds, and processing errors.

- Low cost of less than 5 yen per stamp (excluding tax)
The price is less than 5 yen per stamp (excluding tax), and volume discounts are available.

Product website URL: https://www.wingarc.com/product/trustee/ (Japanese)

WingArc's digital document platform

 

We would like to thank the following people for their endorsement of this announcement:

We have been working with WingArc1st for many years to promote business innovation and DX through our strong partnership. In particular, the affinity between the two companies' solutions for complying with the Electronic Books Preservation Act is high and has been well received by many of our customers. We are convinced that the new service, Trustee, is an epoch-making solution that is a condensed version of WingArc1st's solid technical capabilities and deep insight into the market. In particular, the innovative approach of guaranteeing the originality of documents from the moment they are created by adding time stamps at the time of form generation will fundamentally enhance the reliability of electronic documents. We sincerely hope that the linkage between the high availability of Trustee Time Stamping and our workflow system will enable more flexible and speedy business operations than ever before, and contribute to solving our customers' problems. ATLED CORP. Yasuhiro Okamoto, President and Representative Director

Congratulations on the release of "Trustee." Our company is required to implement tamper-proof measures for the electronic delivery of contract-related documents for real estate fractionalization products. Therefore, delivering documents quickly and accurately while maintaining compliance was a major challenge. To address this challenge, "Trustee" is a groundbreaking solution that can potentially complete the entire workflow within our IT environment while ensuring high reliability through Ministry of Internal Affairs and Communications-certified timestamps. We expect this will enable us to achieve both operational efficiency and legal reliability, leading to improved customer satisfaction. Financial Products Group Co., Ltd. Ryuta Kondo, Information System Division 1 Director

I would like to express my support for your new challenge in the digital trust area. Congratulations on the release of Trustee. We have been using the invoiceAgent electronic document platform for many years, and we are confident that Trustee will make a significant contribution to the creation of authentic digital data in forms and document management solutions. The publishing of forms is a time-consuming process. Issuing forms efficiently, while at the same time ensuring digital trust is important. We expect that Trustee's time stamping technology will further improve the linkage with various services. KUWAZAWA Holdings Corporation Yuuki Endo, Deputy General Manager, Administration Division

Congratulations on the release of the digital trust service, Trustee. We have been working to reduce mailing costs and improve efficiency in electronic invoice delivery and compliance with the Electronic Books Preservation Act by utilizing invoiceAgent and digital trust services. We are very pleased that this digital trust service will further improve our service level. We hope that it will be a solution that encourages business-to-business electronic transactions and data storage. The Chiba Kogyo Bank, Ltd. Toshikazu Horiuchi, Executive Officer and General Manager of Digital Innovation Department, Digital Innovation Division

NEC has built a deep relationship of trust through joint market development and technology co-creation over more than 20 years of strong partnership.  We are convinced that this new product is a groundbreaking service that meets the needs for safety and reliability required in the age of AI and digital trust. We will contribute to further business growth of our customers by utilizing WingArc 1st's new product in NEC's value creation model "BluStellar", which leads customers' transformation to success. NEC Corporation Kazunori Minamoto, Corporate SVP

(*1) 1,000 times faster than existing products (according to our research)
(*2) Digital trust is the assurance in the digital space that the person or entity carrying the information is genuine and that the information has not been tampered with.
(*3) "Trustee Type Stamp" uses "WingArc Time Stamp Service," an authorized time certification service in accordance with Notification No. 146 of the Ministry of Internal Affairs and Communications in 2021.
https://www.soumu.go.jp/menu_news/s-news/01cyber01_02000001_00245.html (Japanese)
 (*4) A lower volume discount is applied according to the amount of usage.
 (*5) A summary of the survey is as follows

•  Survey title: Electronic Document and Data Security Survey
•  Survey target: Persons in charge of time stamping-related operations at companies with annual sales of 10 billion yen or more in Japan
•  Number of valid responses: 500
•  Survey period: July 18, 2025 to July 18, 2025
•  Survey organization: WingArc's own survey (survey consignee: IDEATECH Co., Ltd.)
•  Survey method: Online survey

■23.6% of respondents are concerned about the possibility of not being able to detect tampering by generative AI with important documents.
When asked, "What concerns you most about electronic documents handled in business-to-business transactions due to the development of generative AI technology", 23.6% of the respondents were concerned about "the possibility of not being able to detect tampering of important documents by AI," 22.4% were concerned about "difficulty in confirming the authenticity of documents from business partners," and 20.4% were concerned about "the ease of creating sophisticated forged documents".

■More than 30% of respondents have experienced their business partners having doubts about the authenticity of their documents.
When asked "In the past three years, have you experienced any of the following at your place of employment?", 32.2% of the respondents answered that "a business partner questioned whether a document was genuine," 29.6% said "there was a case of suspected falsification," and 22.2% said "I wondered whether a document I received was genuine".

(*6) Summary of the final report of the "Trust Service Review Working Group" [2]​​
(*7) Deloitte Tohmatsu MIC Economic Research Institute Co. Sales and Market Share by Vendor in FY2023