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: "randomized protocols for asynchronous consensus"
  Abstract: The famous Fischer, Lynch, and Paterson impossibility proof shows that it is impossible to solve the consensus problem in a natural model of an asynchronous distributed system if even a single process can fail. Since its publication, two decades of work on fault-tolerant asynchronous consensus algorithms have evaded this impossibility result by using extended models that provide (a) randomization, (b) additional timing assumptions, (c) failure detectors, or (d) stronger synchronization mechanisms than are available in the basic model. Concentrating on the first of these approaches, we illustrate the history and structure of randomized asynchronous consensus protocols by giving detailed descriptions of several such protocols.

Connected through hyperedge HE-1 (induced by source paper "que sera consensus simple asynchronous agreement with private coins and threshold logical clocks"):
  with members:
    - "revisiting fast practical byzantine fault tolerance"
    - "formal verification of multi paxos for distributed consensus"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "keeping authorities honest or bust with decentralized witness cosigning"
    - "on reducing the complexity of matrix clocks"

Connected through hyperedge HE-2 (induced by source paper "two more algorithms for randomized signature free asynchronous binary byzantine consensus with t n 3 and o n 2 messages and o 1 round expected termination"):
  with members:
    - "a simple and efficient binary byzantine consensus algorithm using cryptography and partial synchrony"
    - "a simple and efficient asynchronous randomized binary byzantine consensus algorithm"
    - "cobalt bft governance in open networks"
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-3 (induced by source paper "on probabilistic byzantine fault tolerance"):
  with members:
    - "stakedag stake based consensus for scalable trustless systems"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "practical synchronous byzantine consensus"
    - "efficient synchronous byzantine consensus"

Connected through hyperedge HE-4 (induced by source paper "a simple and efficient asynchronous randomized binary byzantine consensus algorithm"):
  with members:
    - "a simple and efficient binary byzantine consensus algorithm using cryptography and partial synchrony"
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-5 (induced by source paper "a simple and efficient binary byzantine consensus algorithm using cryptography and partial synchrony"):
  with members:
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-6 (induced by source paper "threshold logical clocks for asynchronous distributed coordination and consensus"):
  with members:
    - "sok transparent dishonesty front running attacks on blockchain"
    - "validated asynchronous byzantine agreement with optimal resilience and asymptotically optimal time and word communication"
    - "blockmania from block dags to consensus"
    - "towards more reliable bitcoin timestamps"
    - "coconut threshold issuance selective disclosure credentials with applications to distributed ledgers"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "hijacking bitcoin large scale network attacks on cryptocurrencies"
    - "on reducing the complexity of matrix clocks"

Connected through hyperedge HE-7 (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"
    - "algorand the efficient and democratic ledger"
    - "cryptocurrencies without proof of work"

Connected through hyperedge HE-8 (induced by source paper "stakedag stake based consensus for scalable trustless systems"):
  with members:
    - "onlay online layering for scalable asynchronous bft system"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "blockmania from block dags to consensus"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "cryptocurrencies without proof of work"

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.DS(Data Structures and Algorithms)