Digital Product Passports (DPPs) are emerging as transformative tools for the circular economy by providing detailed, accessible, and traceable lifecycle information. By leveraging blockchain technology, DPPs enhance transparency, data integrity, and interoperability among supply chain stakeholders. This paper reviews the literature on blockchain-based DPPs, focusing on their implementation, applications, and challenges. Drawing on recent academic and industry studies, it identifies key use cases—such as compliance with extended producer responsibility (EPR) policies, material recovery, and product lifecycle management—and highlights blockchain’s potential to overcome limitations like fragmented data systems and security concerns. Applications in sectors including electronics, textiles, and automotive demonstrate improvements in resource efficiency, waste reduction, and closed-loop supply chains. Despite these benefits, challenges remain in scaling, regulatory uncertainties, and the need for standardized frameworks. The study concludes with strategic recommendations—emphasizing enhanced multi-stakeholder collaboration and policy innovation—to unlock the full potential of blockchain-based DPPs in advancing sustainable production and consumption.