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: "topological analysis of bitcoin s lightning network"
  Abstract: Bitcoin’s Lightning Network (LN) is a scalability solution for Bitcoin allowing transactions to be issued with negligible fees and settled instantly at scale. In order to use LN, funds need to be locked in payment channels on the Bitcoin blockchain (Layer-1) for subsequent use in LN (Layer-2). LN is comprised of many payment channels forming a payment channel network. LN’s promise is that relatively few payment channels already enable anyone to efficiently, securely and privately route payments across the whole network. In this paper, we quantify the structural properties of LN and argue that LN’s current topological properties can be ameliorated in order to improve the security of LN, enabling it to reach its true potential.

Connected through hyperedge HE-1 (induced by source paper "hushrelay a privacy preserving efficient and scalable routing algorithm for off chain payments"):
  with members:
    - "concurrency and privacy with payment channel networks"
    - "ant routing algorithm for the lightning network"
    - "routing cryptocurrency with the spider network"
    - "consensus in the age of blockchains"
    - "towards a concurrent and distributed route selection for payment channel networks"
    - "casper the friendly finality gadget"
    - "settling payments fast and private efficient decentralized routing for path based transactions"
    - "voute virtual overlays using tree embeddings"

Connected through hyperedge HE-2 (induced by source paper "on the strength of connectivity of inhomogeneous random k out graphs"):
  with members:
    - "privacy utility tradeoffs in routing cryptocurrency over payment channel networks"
    - "k connectivity in random key graphs with unreliable links"
    - "towards k connectivity in heterogeneous sensor networks under pairwise key predistribution"
    - "dandelion lightweight cryptocurrency networking with formal anonymity guarantees"
    - "high throughput cryptocurrency routing in payment channel networks"
    - "k connectivity of inhomogeneous random key graphs with unreliable links"
    - "toward k connectivity of the random graph induced by a pairwise key predistribution scheme with unreliable links"
    - "modeling the pairwise key predistribution scheme in the presence of unreliable links"

Connected through hyperedge HE-3 (induced by source paper "ant routing scalability for the lightning network"):
  with members:
    - "imbalance measure and proactive channel rebalancing algorithm for the lightning network"
    - "ant routing algorithm for the lightning network"
    - "routing cryptocurrency with the spider network"
    - "txprobe discovering bitcoin s network topology using orphan transactions"
    - "high throughput cryptocurrency routing in payment channel networks"
    - "double spend races"
    - "settling payments fast and private efficient decentralized routing for path based transactions"

Connected through hyperedge HE-4 (induced by source paper "congestion attacks in payment channel networks"):
  with members:
    - "concurrency and privacy with payment channel networks"
    - "privacy utility tradeoffs in routing cryptocurrency over payment channel networks"
    - "hijacking routes in payment channel networks a predictability tradeoff"
    - "discharged payment channels quantifying the lightning network s resilience to topology based attacks"
    - "towards secure and efficient payment channels"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-5 (induced by source paper "sharper sharding permissioned blockchains over network clusters"):
  with members:
    - "resilientdb global scale resilient blockchain fabric"
    - "parblockchain leveraging transaction parallelism in permissioned blockchain systems"
    - "fastfabric scaling hyperledger fabric to 20 000 transactions per second"
    - "scaling blockchain databases through parallel resilient consensus paradigm"
    - "seemore a fault tolerant protocol for hybrid cloud environments"
    - "streamchain do blockchains need blocks"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "towards scaling blockchain systems via sharding"

Connected through hyperedge HE-6 (induced by source paper "a cryptoeconomic traffic analysis of bitcoins lightning network"):
  with members:
    - "privacy utility tradeoffs in routing cryptocurrency over payment channel networks"
    - "the evolution of lightning network s topology during its first year and the influence over its core values"
    - "payment networks as creation games"
    - "discharged payment channels quantifying the lightning network s resilience to topology based attacks"
    - "ant routing algorithm for the lightning network"
    - "payment network design with fees"
    - "towards an economic analysis of routing in payment channel networks"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-7 (induced by source paper "discharged payment channels quantifying the lightning network s resilience to topology based attacks"):
  with members:
    - "towards secure and efficient payment channels"
    - "decentralization in bitcoin and ethereum networks"
    - "towards a concurrent and distributed route selection for payment channel networks"
    - "settling payments fast and private efficient decentralized routing for path based transactions"
    - "teechan payment channels using trusted execution environments"

Connected through hyperedge HE-8 (induced by source paper "a percolation model for the emergence of the bitcoin lightning network"):
  with members:
    - "a model of the optimal selection of crypto assets"
    - "a cryptoeconomic traffic analysis of bitcoins lightning network"
    - "discharged payment channels quantifying the lightning network s resilience to topology based attacks"
    - "how to charge lightning"

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)