Brief Overview

Guardtime provides a family of security solutions based on its keyless signature infrastructure (KSI) that enable data integrity, protection, and governance through block chain.


A.H. Tammsaare tee 60
Tallinn, 11316

US Office in Irvine
5151 California Ave
Suite 210
Irvine, California 92617


Mike Gault, Founder and CEO of Guardtime, spent ten years as a derivatives trader at Credit Suisse and Barclays Capital.


Mike Gault founded the company in 2007 after the large Estonian cyber attack. The company is headquartered in Estonia with offices in the U.S., the U.K., Singapore, and the Netherlands.

Key Competitors

BHC Laboratory

Products and Services

Guardtime’s solutions are based on keyless signature infrastructure, which is a quantum-immune Exabyte-scale digital signature system for protecting data by algorithmically proving the time, origin, and integrity. The specific products offered by Guardtime to enable information assurance, attributable networks, data breach management, insider threat mitigation, and secure email messaging include the following:

• GuardVIEW – The GuardVIEW SOC product provides the ability for a NOC/SOC to visualize a KSI-enabled network and to provide chain-of-custody and integrity intelligence for all assets, applications, services, and security components. The GuardVIEW ANS product provides advanced real-time monitoring, reporting, and search features for integrity assurance, continuous monitoring, and network visualization.
• GuardSHIELD – Allows for integrity monitoring and management across cloud services and virtualized environments. GuardSHIELD comes APLI enabled to support VMware virtualization and VCenter Operation toolsets.
• VIDERI KSI Appliance – This hardware appliance can be used to deploy a KSI system including GuardVIEW and all related capabilities including escrow services and agent deployment support.