In 2019, according to the study “Sustainability in the context of blockchain technology” (Culotta et al. in Sustainability in the context of blockchain technology: Application examples, challenges, and action fields.), the German government was one of the first governments in the world to address the issue of the sustainability of blockchain technologies. The study emphasizes the need for the sustainable use of blockchain technologies in connection with the government's sustainability and climate protection goals. It emphasizes that not all blockchains are resource- and energy-intensive. According to the white paper “Blockchain: fundamentals, applications and potential” (Blockchain—Fraunhofer Fit. (n.d.). https://www.fit.fraunhofer.de/content/dam/fit/de/documents/Blockchain_WhitePaper_Fundamentals-Applications-Potentials.pdf ), a trend is also emerging: the growing popularity of decentralized systems and the increasing attractiveness of programmable blockchains and smart contracts. These developments have not only sparked interest in digital currencies, but also the range of different blockchain platforms and their applications in industry and everyday life.