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: "centrally banked cryptocurrencies"
  Abstract: Current cryptocurrencies, starting with Bitcoin, build a decentralized blockchain-based transaction ledger, maintained through proofs-of-work that also generate a monetary supply. Such decentralization has benefits, such as independence from national political control, but also significant limitations in terms of scalability and computational cost. We introduce RSCoin, a cryptocurrency framework in which central banks maintain complete control over the monetary supply, but rely on a distributed set of authorities, or mintettes, to prevent double-spending. While monetary policy is centralized, RSCoin still provides strong transparency and auditability guarantees. We demonstrate, both theoretically and experimentally, the benefits of a modest degree of centralization, such as the elimination of wasteful hashing and a scalable system for avoiding double-spending attacks.

Connected through hyperedge HE-1 (induced by source paper "on the feasibility of sybil attacks in shard based permissionless blockchains"):
  with members:
    - "polyshard coded sharding achieves linearly scaling efficiency and security simultaneously"
    - "chain of trust can trusted hardware help scaling blockchains"
    - "towards scaling blockchain systems via sharding"
    - "a survey on security and privacy issues of bitcoin"
    - "lagrange coded computing optimal design for resiliency security and privacy"
    - "blockchain mining games"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "solida a blockchain protocol based on reconfigurable byzantine consensus"

Connected through hyperedge HE-2 (induced by source paper "a flexible n 2 adversary node resistant and halting recoverable blockchain sharding protocol"):
  with members:
    - "all that glitters is not bitcoin unveiling the centralized nature of the btc ip network"
    - "anchoring the value of cryptocurrency"
    - "segment blockchain a size reduced storage mechanism for blockchain"
    - "an n 2 byzantine node tolerate blockchain sharding approach"
    - "contract connection an efficient communication protocol for distributed ledger technology"

Connected through hyperedge HE-3 (induced by source paper "verifiable and auditable digital interchange framework"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "sprites and state channels payment networks that go faster than lightning"
    - "chainspace a sharded smart contracts platform"
    - "performance characterization of a commercial video streaming service"
    - "bitcoin ng a scalable blockchain protocol"

Connected through hyperedge HE-4 (induced by source paper "cycledger a scalable and secure parallel protocol for distributed ledger via sharding"):
  with members:
    - "repchain a reputation based secure fast and high incentive blockchain system via sharding"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"

Connected through hyperedge HE-5 (induced by source paper "exploring the attack surface of blockchain a systematic overview"):
  with members:
    - "scalable byzantine consensus via hardware assisted secret sharing"
    - "security services using blockchains a state of the art survey"
    - "a survey on the security of blockchain systems"
    - "an empirical analysis of anonymity in zcash"
    - "towards blockchain driven secure and transparent audit logs"
    - "end to end analysis of in browser cryptojacking"
    - "linbft linear communication byzantine fault tolerance for public blockchains"
    - "a survey on security and privacy issues of bitcoin"

Connected through hyperedge HE-6 (induced by source paper "drynx decentralized secure verifiable system for statistical queries and machine learning on distributed datasets"):
  with members:
    - "helen maliciously secure coopetitive learning for linear models"
    - "evaluating differentially private machine learning in practice"
    - "hotstuff bft consensus in the lens of blockchain"
    - "dp admm admm based distributed learning with differential privacy"
    - "gazelle a low latency framework for secure neural network inference"
    - "plausible deniability for privacy preserving data synthesis"
    - "differentially private federated learning a client level perspective"
    - "towards practical differential privacy for sql queries"

Connected through hyperedge HE-7 (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"
    - "topological analysis of bitcoin s lightning network"
    - "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"

Connected through hyperedge HE-8 (induced by source paper "ostraka secure blockchain scaling by node sharding"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "hotstuff bft consensus in the lens of blockchain"
    - "split scale scaling bitcoin by partitioning the utxo space"
    - "dietcoin shortcutting the bitcoin verification process for your smartphone"
    - "chainspace a sharded smart contracts platform"
    - "adding concurrency to smart contracts"
    - "casper the friendly finality gadget"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"

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)