Dr. Tali Rezun Bio

Head of 4thtech initiative, UN/CEFACT blockchain expert

Personal Details

Dr. Tali Rezun started his entrepreneurial career at the age of 18 and grew his business organically until this day. Under the domain of Cotrugli Business School, Tali finished his Business Master (i.e. EMBA) and later in 2018 his Business Doctorate (i.e. DBA). Dr. Rezun specializes in online technologies with focus on brand awareness, web application development and blockchain technology.

“The goal was to develop a model that could assist companies in developing a successful online brand presence and super-charge them with online-brand awareness, digital transformation and future technologies.”

Dr. Tali Rezun is head of the 4thpillar technologies (i.e. 4thtech) initiative, a lecturer at Cotrugli Business School and resident speaker at Blockchain Adria. His expertise includes blockchain enterprise adoption, digital identity, electronic data and documents exchange, document notarisation and blockchain technology in general. Dr. Rezun also advises organisations and startups regarding blockchain adoption.


From the beginning of 2020, he is a core member of the UNECE project that follows two goals; (1) to develop a framework/mechanism for development and implementation UN/CEFACT blockchain services infrastructure, which will be compatible and in line with other services infrastructure and usable or extendable globally, and; (2) to create a whitepaper on strategy for development and implementation of interoperable global blockchain technology infrastructure, taking into consideration existing standards for implementation of cross border Blockchain infrastructure in an interoperable manner.

Dr. Tali Rezun is also a core team member of the SI-Chain initiative. First national blockchain pilot infrastructure that was established with the support of the Slovenian Ministry of Economic Development and Technology by the innovative technology company HashNet in cooperation with Telemach, a telecommunication solutions provider. The technology network facilitates transactions and the creation of smart contracts. 4thtech was deployed on SI-Chain as the first application suite, enabling digital identity and secure reliable exchange of documents and data with notarisation across borders and sectors.

In 2017, Dr. Tali Rezun initiated the 4thtech project, which proposed and later developed a solution, which leverages trust provided by the blockchain to provide secure, immutable, instant cross-border electronic data and document exchange and eDelivery (i.e. FOURdx). Digital identity mechanism (i.e. FOURid) later followed, which can with the help of X.509 EU certificate standard verify the connection between a blockchain wallet and a person. Notarisation service (i.e. FOURns) is also an essential part of the 4thtech ecosystem and provides unique digital document timestamp and authenticity verification.


Digital technology fascinated him already since 1997 when he managed to build the first working audio digital production studio in Slovenia. The studio enabled the recording of multiple audio tracks and execute precision editing, which was impossible to do at conventional analogue studios at the time. Electronic music and music production remain Tali’s passion until this day. 


“Digital technology is my steady companion now for over 25 years, it enabled me to achieve the desired goals, which would otherwise be unreachable.”

Before diving deep into blockchain technology Dr. Tali Rezun founded an agency with a focus on online brand awareness, online application development and digital content production. Read more: https://online-guerrilla.com/. In May 2018 Adriatic council awarded Dr. Tali Rezun with the Beyond 4.0 award for his dedication, promotion and accomplishment in the field of science, new technologies and innovation for the 4thpillar technologies blockchain solutions.