Blockchain is not a silver bullet for procurement, and it also comes with some challenges. These include technical complexity and scalability, as it is still a nascent and evolving technology that requires a high level of technical expertise and infrastructure to implement and maintain. Additionally, it faces scalability issues such as limited throughput, high energy consumption, and network congestion. Regulatory and legal uncertainty is another challenge, as blockchain operates in a dynamic and diverse regulatory and legal environment, and it may pose challenges for compliance, governance, and liability. It also raises questions about data privacy, security, and ownership, especially in cross-border transactions. Lastly, blockchain requires a shift in mindset and culture, from a centralized and hierarchical system to a decentralized and networked one. This shift requires a high level of trust and cooperation among participants, which may be difficult to achieve and sustain.