Design feature DF6: Verification storage system
An independent verification storage system holds the hashes used to verify data integrity on the blockchain.
Source paper
This design feature is a technology-specific realization proposed by Blockchain for the IoT: Privacy-Preserving Protection of Sensor Data (Mathieu Chanson, Andreas Bogner, Dominik Bilgeri, Elgar Fleisch, Felix Wortmann, 2019).