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: "decentralization in bitcoin and ethereum networks"
  Abstract: Blockchain-based cryptocurrencies have demonstrated how to securely implement traditionally centralized systems, such as currencies, in a decentralized fashion. However, there have been few measurement studies on the level of decentralization they achieve in practice. We present a measurement study on various decentralization metrics of two of the leading cryptocurrencies with the largest market capitalization and user base, Bitcoin and Ethereum. We investigate the extent of decentralization by measuring the network resources of nodes and the interconnection among them, the protocol requirements affecting the operation of nodes, and the robustness of the two systems against attacks. In particular, we adapted existing internet measurement techniques and used the Falcon Relay Network as a novel measurement tool to obtain our data. We discovered that neither Bitcoin nor Ethereum has strictly better properties than the other. We also provide concrete suggestions for improving both systems.

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"
    - "dandelion lightweight cryptocurrency networking with formal anonymity guarantees"
    - "dandelion redesigning the bitcoin network for anonymity"
    - "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 "anchoring the value of cryptocurrency"):
  with members:
    - "towards scaling blockchain systems via sharding"
    - "dissecting ponzi schemes on ethereum identification analysis and impact"
    - "blockchain based trust authentication for decentralized sensor networks"
    - "smart contract templates foundations design landscape and research directions"
    - "majority is not enough bitcoin mining is vulnerable"
    - "market oriented cloud computing vision hype and reality for delivering it services as computing utilities"
    - "cloud computing and grid computing 360 degree compared"

Connected through hyperedge HE-3 (induced by source paper "generic superlight client for permissionless blockchains"):
  with members:
    - "fraud and data availability proofs maximising light client security and scaling blockchains with dishonest majorities"
    - "betrayal distrust and rationality smart counter collusion contracts for verifiable cloud computing"
    - "computational extensive form games"
    - "sequential equilibrium in computational games"
    - "on bitcoin and red balloons"

Connected through hyperedge HE-4 (induced by source paper "comparison of decentralization in dpos and pow blockchains"):
  with members:
    - "impossibility of full decentralization in permissionless blockchains"
    - "incentivized blockchain based social media platforms a case study of steemit"
    - "popularity and quality in social news aggregators a study of reddit and hacker news"
    - "the miner s dilemma"
    - "majority is not enough bitcoin mining is vulnerable"

Connected through hyperedge HE-5 (induced by source paper "all that glitters is not bitcoin unveiling the centralized nature of the btc ip network"):
  with members:
    - "digging into browser based crypto mining"
    - "txprobe discovering bitcoin s network topology using orphan transactions"
    - "block arrivals in the bitcoin blockchain"
    - "an evaluation of the security of the bitcoin peer to peer network"

Connected through hyperedge HE-6 (induced by source paper "modeling the impact of network connectivity on consensus security of proof of work blockchain"):
  with members:
    - "a survey of distributed consensus protocols for blockchain networks"
    - "consensus in the age of blockchains"
    - "optimal selfish mining strategies in bitcoin"
    - "majority is not enough bitcoin mining is vulnerable"

Connected through hyperedge HE-7 (induced by source paper "a survey on consensus mechanisms and mining strategy management in blockchain networks"):
  with members:
    - "information and communications technologies for sustainable development goals state of the art needs and perspectives"
    - "a scale out blockchain for value transfer with spontaneous sharding"
    - "a survey on security and privacy issues of bitcoin"
    - "on cyber risk management of blockchain networks a game theoretic approach"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "competitive data trading in wireless powered internet of things iot crowdsensing systems with blockchain"
    - "blockchained on device federated learning"
    - "decentralized caching for content delivery based on blockchain a game theoretic perspective"

Connected through hyperedge HE-8 (induced by source paper "a survey of distributed consensus protocols for blockchain networks"):
  with members:
    - "deconstructing blockchains a comprehensive survey on consensus membership and structure"
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "scalable bft consensus mechanism through aggregated signature gossip"
    - "asymmetric distributed trust"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "correctness and fairness of tendermint core blockchains"
    - "blockchains consensus protocols in the wild"

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)