Dear Colleagues,

Since the arrival of the Bitcoin blockchain in 2008, we have seen a large number of distributed ledger technologies or blockchain solutions that have helped solve a number of problems that were impossible to solve with previous approaches. The impressive advances of this technology are essentially due to the distributed, decentralized, immutable and secure nature of a digital ledger. Many electronic and IoT (Internet of Things) technologies have incorporated blockchains with varying degrees of success.

The purpose of this Special Issue is, therefore, to provide an opportunity for researchers and industrialists to showcase their state-of-the-art research on the subject of IoT and blockchain integration. Papers addressing blockchain applications for IoT architectures are particularly welcome. Topics of interest include, but are not limited to, the following:

• Industrial case studies of the blockchain and IoT;
• Industrial case studies on SoC solutions that access the blockchain under the communication constraints imposed by IoT;
• Novel designs of IoT architectures or software solutions that facilitate blockchain and cryptography implementation, such as lightweight cryptography, attack avoidance, speedy consensus algorithms, reductions in data traffic on the blockchain, and data storage in close proximity to the DLT;
• Experimental results on the performance of DLT or blockchain solutions;
• Smart contracts integrated in the IoT, languages of such smart contracts, and solutions that interconnect different blockchains;
• Methodologies from software engineering that model, test, and validate blockchain/IoT application cases, and the formal verification of DSLs (domain-specific languages) for smart contracts;
• Ecosystems for IoT and blockchain applications;
• Blockchain development frameworks suitable for integration with the IoT.

The aim of this Special Issue is to collect original and innovative works on all aspects of blockchains for IoT integration which review and report the state of the art, highlight challenges, and point to future directions.

Prof. Dr. François Verdier
Guest Editor

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• Blockchain for Internet of Things Applications in Sensors (10 articles)