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: "algorand the efficient and democratic ledger"
  Abstract: Algorand is a truly decentralized, new, and secure way to manage a shared ledger. Unlike prior approaches based on {\em proof of work}, it requires a negligible amount of computation, and generates a transaction history that does not fork with overwhelmingly high probability. This approach cryptographically selects ---in a way that is provably immune from manipulations, unpredictable until the last minute, but ultimately universally clear--- a set of verifiers in charge of constructing a block of valid transactions. This approach applies to any way of implementing a shared ledger via a tamper-proof sequence of blocks, including traditional blockchains. This paper also presents more efficient alternatives to blockchains, which may be of independent interest. #R##N#Algorand significantly enhances all applications based on a public ledger: payments, smart contracts, stock settlement, etc. But, for concreteness, we shall describe it only as a money platform.

Connected through hyperedge HE-1 (induced by source paper "consistency of proof of stake blockchains with concurrent honest slot leaders"):
  with members:
    - "linear consistency for proof of stake blockchains"

Connected through hyperedge HE-2 (induced by source paper "stake shift in major cryptocurrencies an empirical study"):
  with members:
    - "an empirical analysis of anonymity in zcash"

Connected through hyperedge HE-3 (induced by source paper "deconstructing blockchains a comprehensive survey on consensus membership and structure"):
  with members:
    - "dfinity technology overview series consensus system"
    - "analysis of the xrp ledger consensus protocol"
    - "hotstuff bft consensus in the lens of blockchain"
    - "evaluating the red belly blockchain"
    - "an empirical analysis of anonymity in zcash"
    - "a survey on security and privacy issues of bitcoin"
    - "blockchains consensus protocols in the wild"
    - "cachezoom how sgx amplifies the power of cache attacks"

Connected through hyperedge HE-4 (induced by source paper "stairdag cross dag validation for scalable bft consensus"):
  with members:
    - "onlay online layering for scalable asynchronous bft system"
    - "stakedag stake based consensus for scalable trustless systems"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "blockmania from block dags to consensus"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "opera reasoning about continuous common knowledge in asynchronous distributed systems"
    - "cryptocurrencies without proof of work"
    - "randomized protocols for asynchronous consensus"

Connected through hyperedge HE-5 (induced by source paper "incentives in ethereum s hybrid casper protocol"):
  with members:
    - "reward sharing schemes for stake pools"
    - "the impact of uncle rewards on selfish mining in ethereum"
    - "casper the friendly finality gadget"
    - "blockchain mining games"
    - "optimal selfish mining strategies in bitcoin"
    - "cryptocurrencies without proof of work"
    - "majority is not enough bitcoin mining is vulnerable"

Connected through hyperedge HE-6 (induced by source paper "flexible byzantine fault tolerance"):
  with members:
    - "dfinity technology overview series consensus system"
    - "sbft a scalable and decentralized trust infrastructure"
    - "hotstuff bft consensus in the lens of blockchain"
    - "sbft a scalable decentralized trust infrastructure for blockchains"
    - "casper the friendly finality gadget"
    - "flexible paxos quorum intersection revisited"
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-7 (induced by source paper "on incentive compatible role based reward distribution in algorand"):
  with members:
    - "be selfish and avoid dilemmas fork after withholding faw attacks on bitcoin"
    - "blockchain mining games"
    - "bitcoin ng a scalable blockchain protocol"
    - "on subversive miner strategies and block withholding attack in bitcoin digital currency"
    - "the miner s dilemma"
    - "analysis of bitcoin pooled mining reward systems"

Connected through hyperedge HE-8 (induced by source paper "atomic commitment across blockchains"):
  with members:
    - "towards global asset management in blockchain systems"
    - "atomic cross chain swaps"
    - "adding concurrency to smart contracts"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "bitcoin ng a scalable blockchain protocol"

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)