Blockchain has been heralded as a technology that can transform entire sectors, including the public sector where blockchain applications are believed to bring a wide range of benefits. The public sector is lagging behind, however, in its actual adoption of blockchain technology, and our understanding of the factors that explain the slow adoption rate, is lacking. Based on seven case studies of blockchain projects at various adoption stages, this research contributes to our understanding of what factors influence blockchain adoption in the public sector. We use an extended TOE framework that includes an inter-organizational perspective. The findings show that adoption is influenced by the hype around-and resistance toblockchain technology; by top management support, by (perceptions of) the regulatory environment; as well as by trust between blockchain partners, which is both an antecedent as well as a consequence of blockchain adoption.