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Service provisioning is of paramount importance as we are now heading for a world of integrated services giving rise to the next generation of service ecosystems. The huge number of service offerings that will be available for customers in future scenarios require a novel approach to service registry and discovery that lets customers choose those offerings that best match their preferences. One way to achieve this is to introduce the provider&#x2019;s reputation, i.e., a quality indicator of the provisioned service, as an additional search criterion. Now, with blockchain technology in our hands, automated regulation of service-level agreements (SLAs) that capture the mutual agreements between all involved parties has regained momentum. In this article, we report our full-fledged work on the conception, design, and construction of a platform for SLA-minded service provisioning called PenChain. With our work, we demonstrate that penalty-aware SLAs of general services &#x2013; if represented in a machine-readable logic and assisted by distributed ledger technology &#x2013; are programmatically enforceable. We devise algorithms for ranking services in a search result taking into account the digitized values of the SLAs. We offer scenario-based evaluation of PenChain in the field of precision agriculture and the domain of automotive manufacturing. Furthermore, we examine the scalability and the data security of PenChain for precision agriculture.

PenChain: A Blockchain-Based Platform for Penalty-Aware Service Provisioning