Due to its uniquely suited to the knowledge era, the blockchain technology
has currently become highly appealing to the next generation. In addition,
such technology has been recently extended to the internet of things (IoT). In
essence, the blockchain concept necessitates the use of a decentralized data
operation system to store as well as to distribute data and the transactions
across the net. Therefore, this study examines the specific concept of the
blockchain as a decentralized data management system in the face of
probable protection threats. Furthermore, it discusses the present solutions
that can be used to counteract those attacks. The blockchain security
enhancement solutions are included in this study by summarizing the key
points of these solutions. Several blockchain systems and safety devices that
register security defenselessness can be developed using such key points. At
last, this paper discusses the pending matters and the outlook research paths
of blockchain-IoT systems.

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