https://www.ronpub.com/ojiot/OJIOT_2017v3i1n05_Ruta.html Channel of the paper: Michele Ruta, Floriano Scioscia, Saverio Ieva, Giovanna Capurso and Eugenio Di Sciascio: Semantic Blockchain to Improve Scalability in the Internet of Things, Open Journal of Internet Of Things (OJIOT), 3 (1), pages 46-61, URN: urn:nbn:de:101:1-2017080613488, 2017, Special Issue: Proceedings of the International Workshop on Very Large Internet of Things (VLIoT 2017) in conjunction with the VLDB 2017 Conference in Munich, Germany. en-us https://www.ronpub.com/ojiot/OJIOT_2017v3i1n05_Ruta.html http://nbn-resolving.de/urn:nbn:de:101:1-2017080613488 Generally scarce computational and memory resource availability is a well known problem for the IoT, whose intrinsic volatility makes complex applications unfeasible. Noteworthy efforts in overcoming unpredictability (particularly in case of large dimensions) are the ones integrating Knowledge Representation technologies to build the so-called Semantic Web of Things (SWoT). In spite of allowed advanced discovery features, transactions in the SWoT still suffer from not viable trust management strategies. Given its intrinsic characteristics, blockchain technology appears as interesting from this perspective: a semantic resource/service discovery layer built upon a basic blockchain infrastructure gains a consensus validation. This paper proposes a novel Service-Oriented Architecture (SOA) based on a semantic blockchain for registration, discovery, selection and payment. Such operations are implemented as smart contracts, allowing distributed execution and trust. Reported experiments early assess the sustainability of the proposal.