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A survey on security and privacy issues of blockchain technology

  • * Corresponding author: Meng Han

    * Corresponding author: Meng Han 
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  • Blockchain is gaining traction and can be termed as one of the furthermost prevalent topics nowadays. Although critics question about its scalability, security, and sustainability, it has already transformed many individuals' lifestyle in some areas due to its inordinate influence on industries and businesses. Granting that the features of blockchain technology guarantee more reliable and expedient services, it is important to consider the security and privacy issues and challenges behind the innovative technology. The spectrum of blockchain applications range from financial, healthcare, automobile, risk management, Internet of things (IoT) to public and social services. Several studies focus on utilizing the blockchain data structure in various applications. However, a comprehensive survey on technical and applications perspective has not yet been accomplished. In this paper, we try to conduct a comprehensive survey on the blockchain technology by discussing its structure to different consensus algorithms as well as the challenges and opportunities from the prospective of security and privacy of data in blockchains. Furthermore, we delve into future trends the blockchain technology can adapt in the years to come.

    Index Terms- Blockchains, Future Trends of Blockchains, Security, Privacy

    Mathematics Subject Classification: Primary: 90B10, 94A15; Secondary: 94A60.


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  • Figure 1.  Illustration of Blockchain Elements

    Figure 2.  Blockchain Structure

    Figure 3.  Consensus Algorithms

    Figure 4.  Types of Blockchains

    Figure 5.  Pattern Representation of Blockchain Types

    Figure 6.  Aspects of Blockchain

    Figure 7.  Areas of Application of the Blockchain Technology

    Figure 8.  Blockchain in Financial Transactions

    Figure 9.  Blockchain in Healthcare Transactions

    Figure 10.  Blockchain in Internet of Things

    Figure 11.  Blockchain in Mobile Applications

    Figure 12.  Blockchain in Automobile Applications

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