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The Internet of Things (IoT) promises to yield a plethora of new innovative applications based on highly interconnected devices. In order to enable IoT applications for critical and/or sensitive use cases, it is important to (i) foster their dependability by assuring and verifying the integrity and correctness of data processed in such applications, and (ii) adequately account for privacy and confidentiality concerns. For addressing these requirements, IoT systems can be equipped with data provenance mechanisms for maintaining information on the lineage and ownership of data. However, in order to provide secure and dependable IoT systems, provenance data needs to be sufficiently protected against tampering and unauthorized access. In this paper, we present a novel framework for cryptographic provenance data protection and access control based on blockchain technology and confidentiality policies.