  Blockchain technology promises to overcome trust and privacy concerns
inherent to centralized information sharing. However, current decentralized
supply chain management systems do either not meet privacy and scalability
requirements or require a trustworthy consortium, which is challenging for
increasingly dynamic supply chains with constantly changing participants. In
this paper, we propose CCChain, a scalable and privacy-aware supply chain
management system that stores all information locally to give companies
complete sovereignty over who accesses their data. Still, tamper protection of
all data through a permissionless blockchain enables on-demand tracking and
tracing of products as well as reliable information sharing while affording the
detection of data inconsistencies. Our evaluation confirms that CCChain offers
superior scalability in comparison to alternatives while also enabling near
real-time tracking and tracing for many, less complex products.
