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: "on reducing the complexity of matrix clocks"
  Abstract: Matrix clocks are a generalization of the notion of vector clocks that allows the local representation of causal precedence to reach into an asynchronous distributed computation's past with depth x, where x ≥ 1 is an integer. Maintaining matrix clocks correctly in a system of n nodes requires that every message be accompanied by O(nx) numbers, which reflects an exponential dependency of the complexity of matrix clocks upon the desired depth x. We introduce a novel type of matrix clock, one that requires only nx numbers to be attached to each message while maintaining what for many applications may be the most significant portion of the information that the original matrix clock carries. In order to illustrate the new clock's applicability, we demonstrate its use in the monitoring of certain resource-sharing computations.

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"
    - "randomized protocols for asynchronous consensus"

Connected through hyperedge HE-2 (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"
    - "secure history preservation through timeline entanglement"

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.DC(Distributed, Parallel, and Cluster Computing)