  We propose a novel distributed integrity-preserving framework for storing
trust information in crowdsourced IoT environments. The integrity and
availability of the trust information is paramount to ensure accurate trust
assessment. Our proposed framework leverages the blockchain to build a
distributed storage medium for trust-related information that ensures its
integrity. We propose a geo-scoping approach, which ensures that trust-related
information is only available where needed, thus, enabling fast access and
storage space preservation. We conduct several experiments using real datasets
to highlight the effectiveness of our framework.
