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: "lapps technological legal and market potentials of blockchain lightning network applications"
  Abstract: Following in the footsteps of pioneer Bitcoin, many altcoins as well as coloured coins have been being developed and merchandised adopting blockchain as the core enabling technology. However, since interoperability and scalability, due to high and capped (in particular cases) transaction latency are deep-rooted in the architecture of blockchain technology, they are by default inherited in any blockchain based applications. Lightning Network (LN) is one of the supporting technologies developed to eliminate this impediment of blockchain technology by facilitating instantaneous transfers of cryptos. Since the potentials of LN is still relatively unknown, this paper investigates the current states of development along with possible non-monetary usage of LN, especially in settlement coloured coins such as securities, as well as creation of new business models based on Lightning Applications (LApps) and microchannel payments as well as micro-trades. The legal challenges that may act as impediment to the adoption of LN is also discussed.

Connected through hyperedge HE-1 (induced by source paper "blockchain of things bcot the fusion of blockchain and iot technologies"):
  with members:
    - "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"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "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:
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "applications of blockchain technology beyond cryptocurrency"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "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"

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.CR(Cryptography and Security)