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: "dandelion redesigning the bitcoin network for anonymity"
  Abstract: Bitcoin and other cryptocurrencies have surged in popularity over the last decade. Although Bitcoin does not claim to provide anonymity for its users, it enjoys a public perception of being a `privacy-preserving' financial system. In reality, cryptocurrencies publish users' entire transaction histories in plaintext, albeit under a pseudonym; this is required for transaction validation. Therefore, if a user's pseudonym can be linked to their human identity, the privacy fallout can be significant. Recently, researchers have demonstrated deanonymization attacks that exploit weaknesses in the Bitcoin network's peer-to-peer (P2P) networking protocols. In particular, the P2P network currently forwards content in a structured way that allows observers to deanonymize users. In this work, we redesign the P2P network from first principles with the goal of providing strong, provable anonymity guarantees. We propose a simple networking policy called Dandelion, which achieves nearly-optimal anonymity guarantees at minimal cost to the network's utility. We also provide a practical implementation of Dandelion.

Connected through hyperedge HE-1 (induced by source paper "stability and scalability of blockchain systems"):
  with members:
    - "prism scaling bitcoin by 10 000x"
    - "markov processes in blockchain systems"
    - "decentralization in bitcoin and ethereum networks"
    - "dandelion lightweight cryptocurrency networking with formal anonymity guarantees"
    - "majority is not enough bitcoin mining is vulnerable"
    - "can p2p networks be super scalable"
    - "stability of a peer to peer communication system"
    - "gossiping with multiple messages"

Connected through hyperedge HE-2 (induced by source paper "privacy utility tradeoffs in routing cryptocurrency over payment channel networks"):
  with members:
    - "concurrency and privacy with payment channel networks"
    - "celer network bring internet scale to every blockchain"
    - "routing cryptocurrency with the spider network"
    - "ohie blockchain scaling made simple"
    - "high throughput cryptocurrency routing in payment channel networks"
    - "settling payments fast and private efficient decentralized routing for path based transactions"
    - "deanonymisation of clients in bitcoin p2p network"
    - "extremal mechanisms for local differential privacy"

Connected through hyperedge HE-3 (induced by source paper "approximate identification of the optimal epidemic source in complex networks"):
  with members:
    - "the spread of low credibility content by social bots"
    - "detection and analysis of 2016 us presidential election related rumors on twitter"
    - "the spread of fake news by social bots"
    - "multiple infection sources identification with provable guarantees"
    - "identification of patient zero in static and temporal networks robustness and limitations"
    - "how to identify an infection source with limited observations"
    - "information source detection in the sir model a sample path based approach"
    - "social structure of facebook networks"

Connected through hyperedge HE-4 (induced by source paper "a survey on security and privacy issues of bitcoin"):
  with members:
    - "concurrency and privacy with payment channel networks"
    - "consensus in the age of blockchains"
    - "when the cookie meets the blockchain privacy risks of web payments via cryptocurrencies"
    - "be selfish and avoid dilemmas fork after withholding faw attacks on bitcoin"
    - "socially optimal mining pools"
    - "the balance attack against proof of work blockchains the r3 testbed as an example"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "blockchain mining games"

Connected through hyperedge HE-5 (induced by source paper "transaction propagation on permissionless blockchains incentive and routing mechanisms"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "understanding modern banking ledgers through blockchain technologies future of transaction processing and smart contracts on the internet of money"
    - "optimal selfish mining strategies in bitcoin"
    - "bitcoin ng a scalable blockchain protocol"
    - "deanonymisation of clients in bitcoin p2p network"
    - "on subversive miner strategies and block withholding attack in bitcoin digital currency"
    - "cryptocurrencies without proof of work"

Connected through hyperedge HE-6 (induced by source paper "dandelion lightweight cryptocurrency networking with formal anonymity guarantees"):
  with members:
    - "anonymity properties of the bitcoin p2p network"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "hijacking bitcoin large scale network attacks on cryptocurrencies"
    - "deanonymisation of clients in bitcoin p2p network"
    - "bitcoin over tor isn t a good idea"
    - "spy vs spy rumor source obfuscation"
    - "a robust information source estimator with sparse observations"
    - "pisces anonymous communication using social networks"

Connected through hyperedge HE-7 (induced by source paper "a flexible network approach to privacy of blockchain transactions"):
  with members:
    - "deanonymisation of clients in bitcoin p2p network"
    - "spy vs spy rumor source obfuscation"

Connected through hyperedge HE-8 (induced by source paper "information propagation on permissionless blockchains"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "deanonymisation of clients in bitcoin p2p network"
    - "on subversive miner strategies and block withholding attack in bitcoin digital currency"
    - "the miner s dilemma"
    - "on bitcoin and red balloons"
    - "analysis of bitcoin pooled mining reward systems"

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)