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: "correctness analysis of ibft"
  Abstract: In this paper we analyse the correctness of Istanbul BFT (IBFT), which is a Byzantine-fault-tolerant (BFT) proof-of-authority (PoA) blockchain consensus protocol that ensures immediate finality. We show that the IBFT protocol does not guarantee Byzantine-fault-tolerant consistency and liveness when operating in an eventually synchronous network, and we propose modifications to the protocol to ensure both Byzantine-fault-tolerant consistency and liveness in eventually synchronous settings.

Connected through hyperedge HE-1 (induced by source paper "tenderbake classical bft style consensus for public blockchains"):
  with members:
    - "introduction to the tezos blockchain"
    - "dissecting tendermint"
    - "dfinity technology overview series consensus system"
    - "the latest gossip on bft consensus"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "blockchains consensus protocols in the wild"
    - "consensus in the age of blockchains"
    - "leader randomization signature free byzantine consensus for consortium blockchains"

Connected through hyperedge HE-2 (induced by source paper "formal verification of blockchain byzantine fault tolerance"):
  with members:
    - "on the correctness of egalitarian paxos"
    - "the consensus number of a cryptocurrency"
    - "dissecting tendermint"
    - "the latest gossip on bft consensus"
    - "analysis of the xrp ledger consensus protocol"
    - "evaluating the red belly blockchain"
    - "sbft a scalable decentralized trust infrastructure for blockchains"
    - "correctness and fairness of tendermint core blockchains"

Connected through hyperedge HE-3 (induced by source paper "certifying blockchain byzantine fault tolerance"):
  with members:
    - "on the correctness of egalitarian paxos"
    - "the consensus number of a cryptocurrency"
    - "dissecting tendermint"
    - "the latest gossip on bft consensus"
    - "analysis of the xrp ledger consensus protocol"
    - "evaluating the red belly blockchain"
    - "sbft a scalable decentralized trust infrastructure for blockchains"
    - "blockchains consensus protocols in the wild"

Connected through hyperedge HE-4 (induced by source paper "atomic crosschain transactions for ethereum private sidechains"):
  with members:
    - "sidechains and interoperability"
    - "anonymous state pinning for private blockchains"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "requirements for ethereum private sidechains"

Connected through hyperedge HE-5 (induced by source paper "ibft 2 0 a safe and live variation of the ibft blockchain consensus protocol for eventually synchronous networks"):
  with members:
    - "casper the friendly finality gadget"

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)