For the Inventor, By the Inventor

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Tortola, Virgin Islands, British

Guardtime IP Holdings Limited

USPTO Granted Patents = 21

EPO Patents = 1

Forward Citations = 125

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18 inventors (with patents filed for the assignee):

Ahto Buldas (12 out of 18 patents)

Jeffrey Pearce (10 out of 12 patents)

Andres Kroonmaa (5 out of 6 patents)

4. Ahto Truu (4 out of 9 patents)

5. Garrett Day (4 out of 5 patents)

6. Märt Saarepera (4 out of 4 patents)

7. David E Hamilton, Jr (3 out of 3 patents)

8. Kevin Zawicki (3 out of 3 patents)

9. Roger Guseman (3 out of 3 patents)

10. Michael Gault (3 out of 3 patents)

11. Risto Laanoja (2 out of 4 patents)

12. Hema Krishnamurthy (2 out of 12 patents)

13. Martin Ruubel (2 out of 2 patents)

14. Mart Saarepera (2 out of 7 patents)

15. Nicholas Child (1 out of 1 patent)

21 patents: Sort by Forward Citations

1. 10297094 - Challenge-response access control using context-based proof (2019-05-21),

2. 10284568 - System and method for secure transmission of streamed data frames (2019-05-07),

3. 10277608 - System and method for verification lineage tracking of data sets (2019-04-30),

4. 10249114 - System and method for access control using context-based proof (2019-04-02),

5. 10158492 - Blockchain-supported device location verification with digital signatures (2018-12-18),

6. 10103893 - Blockchain-supported, fail-safe synchronization in a data authentication infrastructure (2018-10-16),

7. 10068397 - System and method for access control using context-based proof (2018-09-04),

8. 9911007 - Redundant fail-safe synchronization in a data authentication infrastructure (2018-03-06),

9. 9876779 - Document verification with distributed calendar infrastructure (2018-01-23),

10. 9853819 - Blockchain-supported, node ID-augmented digital record signature method (2017-12-26),

11. 9697340 - System and methods with assured one-time, replay-resistant passwords (2017-07-04),

12. 9614682 - System and method for sequential data signatures (2017-04-04),

13. 9473510 - System and method for location verification (2016-10-18),

14. 9473306 - Document verification with ID augmentation (2016-10-18),

15. 9268969 - System and method for field-verifiable record authentication (2016-02-23),

Company Overview

Guardtime IP Holdings Limited is a technology company based in Tortola, VG, specializing in advanced cybersecurity solutions and blockchain technology. The organization is known for its innovative approaches to data integrity and security, leveraging cryptographic techniques to ensure the authenticity and reliability of digital information. Guardtime's expertise spans various sectors, including finance, healthcare, and government, where it aims to enhance trust and transparency in digital transactions and data management.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

21 Patents

#30 in Tortola

#38 in Virgin Islands, British

#29,961 in the World

Tortola, Virgin Islands, British

Guardtime IP Holdings Limited

Forward Citations = 125

18 inventors:

Ahto Buldas (12 out of 18 patents)

Jeffrey Pearce (10 out of 12 patents)

Andres Kroonmaa (5 out of 6 patents)

4. Ahto Truu (4 out of 9 patents)

5. Garrett Day (4 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Guardtime IP Holdings Limited. Retrieved from https://idiyas.com/company/guardtime-ip-holdings

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

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