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: "proof of execution reaching consensus through fault tolerant speculation"
  Abstract: Since the introduction of blockchains, several new database systems and applications have tried to employ them. At the core of such blockchain designs are Byzantine Fault-Tolerant (BFT) consensus protocols that enable designing systems that are resilient to failures and malicious behavior. Unfortunately, existing BFT protocols seem unsuitable for usage in database systems due to their high computational costs, high communication costs, high client latencies, and/or reliance on trusted components and clients. #R##N#In this paper, we present the Proof-of-Execution consensus protocol (PoE) that alleviates these challenges. At the core of PoE are out-of-order processing and speculative execution, which allow PoE to execute transactions before consensus is reached among the replicas. With these techniques, PoE manages to reduce the costs of BFT in normal cases, while still providing reliable consensus toward clients in all cases. #R##N#We envision the use of PoE in high-performance resilient database systems. To validate this vision, we implement PoE in our efficient ResilientDB blockchain and database framework. ResilientDB helps us to implement and evaluate PoE against several state-of-the-art BFT protocols. Our evaluation shows that PoE achieves up to $86\%$ more throughput than existing BFT protocols.

Connected through hyperedge HE-1 (induced by source paper "resilientdb global scale resilient blockchain fabric"):
  with members:
    - "towards scaling blockchain systems via sharding"
    - "blockbench a framework for analyzing private blockchains"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "bitcoin ng a scalable blockchain protocol"

Connected through hyperedge HE-2 (induced by source paper "permissioned blockchain through the looking glass architectural and implementation lessons learned"):
  with members:
    - "scaling blockchain databases through parallel resilient consensus paradigm"
    - "scalable byzantine consensus via hardware assisted secret sharing"
    - "revisiting consensus protocols through wait free parallelization"
    - "streamchain do blockchains need blocks"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "revisiting fast practical byzantine fault tolerance"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"

Connected through hyperedge HE-3 (induced by source paper "cogsworth byzantine view synchronization"):
  with members:
    - "threshold logical clocks for asynchronous distributed coordination and consensus"
    - "the latest gossip on bft consensus"
    - "sbft a scalable and decentralized trust infrastructure"
    - "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.DB(Databases)