https://www.openfest.org/2017/en/2017/10/27/how-does-blockchain-technology-work-martin-kuvandzhiev-will-tell-us-at-openfest/ OpenFest is the only conference of its kind in Bulgaria, dedicated to open culture, free and open-source software, the free exchange of knowledge - a festival of the open culture. Fri, 27 Oct 2017 16:04:57 +0000 hourly 1 https://wordpress.org/?v=5.2.20