human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "application of blockchain in booking and registration systems of securities exchanges"
  Abstract: Securities exchange being digitalised and online, security of information and data has become a major concern. Blockchain (BC) technology, being distributed and immutable in nature, has proved to the "Trust Machine" eliminating the need for third-parties. Authors of this paper investigate how Blockchain can be used to secure stock exchange transactions, with an especial focus to the technological as well as legal aspects of such applications. Considering the intricate operational structure of the securities exchange, the research proposes to design, develop and implement a hybrid BC, customised according to the need of the respective stock exchange. The study suggests that the use of such BC can bring many benefits which the other technologies currently being used cannot offer. However, during the design process of any such application using BC, the relevant laws and regulations of the corresponding country need to be considered.

Connected through hyperedge HE-1 (induced by source paper "blockchain of things bcot the fusion of blockchain and iot technologies"):
  with members:
    - "lapps technological legal and market potentials of blockchain lightning network applications"
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "challenges of internet of things and big data integration"
    - "a novel approach for network attack classification based on sequential questions"
    - "a survey of distributed certificate authorities in manets"
    - "internet of nano things things and everything future growth trends"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "blockchain enabled enhanced iot ecosystem security"

Connected through hyperedge HE-2 (induced by source paper "performance analytical comparison of blockchain as a service baas platforms"):
  with members:
    - "lapps technological legal and market potentials of blockchain lightning network applications"
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "applications of blockchain technology beyond cryptocurrency"
    - "formal specification and verification of smart contracts for azure blockchain"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "blockchain enabled enhanced iot ecosystem security"
    - "intercloud utility oriented federation of cloud computing environments for scaling of application services"

Connected through hyperedge HE-3 (induced by source paper "lapps technological legal and market potentials of blockchain lightning network applications"):
  with members:
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "applications of blockchain technology beyond cryptocurrency"
    - "a survey of distributed certificate authorities in manets"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "blockchain enabled enhanced iot ecosystem security"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-4 (induced by source paper "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "blockchain enabled enhanced iot ecosystem security"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-5 (induced by source paper "internet of nano things things and everything future growth trends"):
  with members:
    - "internet of things survey on security"
    - "applications of blockchain technology beyond cryptocurrency"
    - "challenges of internet of things and big data integration"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "mobile academy a ubiquitous mobile learning mlearning platform"
    - "a framework for android based shopping mall applications"
    - "multilingual website usability analysis based on an international user survey"
    - "user interface ui design issues for multilingual users a case study"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CY(Computers and Society)