The Hashgraph Group, a Web3 and AI engineering company, and Truesense, a developer of ultra-wideband sensing technology, have announced the filing of a European patent application for Continuous Identity Trust Infrastructure (CITI). The new system is designed to link proof of a person’s physical presence to a decentralized digital identity while protecting personal data.
The patent application was filed with the European Patent Office on April 4, 2026 and covers more than 44 European countries. The companies are also preparing a patent application in the United States.
CITI combines three technologies: ultra-wideband (UWB) detection, decentralized identifiers (DIDs) and zero-knowledge proof (ZKP) cryptography. Together, these technologies make it possible to verify that a person was physically present at a specific place and time, without revealing personal information or location data.
The system works by first detecting the presence of a person via UWB sensors. This event is then linked to a decentralized identity stored in a digital wallet. A verifiable credential is generated, containing a timestamp and cryptographic proof that is permanently recorded on a distributed ledger. Third parties can later verify credentials without gaining access to sensitive data.
According to the companies, the technology could be used in industries where identity verification is important, including finance, healthcare, sports and entertainment. For example, a person can enter a secure building using a digital identity wallet instead of an access badge. The verification event would be recorded on the Hedera network, creating an auditable record and reducing the risk of sharing credentials.
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