![]() Moreover, it provides a flexible, robust cloud computing environment which allows dynamic data integration from a massive network of IoT devices, showing great potentials to improve quality of user experience, system performance and efficiency of service delivery. The Cloud of Things model offers unlimited storage capabilities and processing power enabled by cloud services to IoT applications. Unfortunately, due to the scarcity of memory, power and computational resources of IoT devices, they always delegate IoT application tasks to Cloud computing, which gives birth to the Cloud of Things (CoT) paradigm. IoT has been applied widely in numerous industrial systems such as smart cities, smart industries, healthcare, and agriculture. Typically, IoT is a system of physical objects that can be monitored, controlled or interacted with by ubiquitous electronic devices to enable ubiquitous computing services. IoT has reshaped and transformed our lives with various new industrial, consumer, and commercial services and applications. On the other side, the revolution in the field of information and communication has created a wealth of opportunities for advanced technologies, especially Internet of Things (IoT) and Cloud computing. 1: Past, present and future Cloud of Things infrastructure. ![]() Thus, it makes now the right time to pay attention to this hot research topic. Such exceptional properties promote the usage of applications built on blockchain architecture in recent years. In particular, the blockchain technology also boasts the desirable characteristics of decentralization, accountability, and security which improve service efficiency and save significantly operational costs. Blockchain uses consensus mechanisms and cryptography to validate the legitimacy of data transactions, which guarantees resistance of linked blocks against modifications and alterations. Transactions stored in a chain of blocks are publicly accessible to all blockchain network members in a trustworthy manner. The concept of blockchain is based on a peer-to-peer network architecture in which transaction information is not controlled by any single centralized entity. The blockchain is basically a decentralized, immutable and public database. Moreover, research challenges and future directions are also highlighted.įrom the technical perspective, blockchain is a distributed ledger technology that was firstly used to serve as the public digital ledger of cryptocurrency Bitcoin for economic transactions. Compared to other relevant survey papers, we present a thorough review on the emerging BCoT platforms and services which are useful to researchers and application developers in identifying and catching up with the latest technologies in this fast-growing field. Particularly, we also provide an in-depth survey of BCoT applications with extensive discussion on use-case domains as well as their opportunities in 5G networks and beyond. In this paper, we present a state-of-the-art review on the BCoT integration to provide general readers with the overview of the BCoT in various aspects, including background knowledge, motivation, and integrated architecture. Therefore, a novel paradigm of blockchain and Cloud of Things combination, called as the BCoT model, is regarded as a promising enabler for a wide range of applied scenarios. In this context, blockchain provides innovative solutions to address challenges in Cloud of Things in terms of decentralization, data privacy and network security, while Cloud of Things offer elasticity and scalability functionalities to improve efficiency of blockchain operations. One of them is Cloud of Things enabled by the corporation of Cloud computing and Internet of Things (IoT). Blockchain with its decentralized, transparent and secure nature has emerged as a disruptive technology for the next generation of numerous industrial applications. The blockchain technology is taking the world by storm.
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