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: "a byzantine fault tolerant ordering service for the hyperledger fabric blockchain platform"
  Abstract: Hyperledger Fabric (HLF) is a flexible permissioned blockchain platform designed for business applications beyond the basic digital coin addressed by Bitcoin and other existing networks. A key property of HLF is its extensibility, and in particular the support for multiple ordering services for building the blockchain. Nonetheless, the version 1.0 was launched in early 2017 without an implementation of a Byzantine fault-tolerant (BFT) ordering service. To overcome this limitation, we designed, implemented, and evaluated a BFT ordering service for HLF on top of the BFT-SMaRt state machine replication/consensus library, implementing also optimizations for wide-area deployment. Our results show that HLF with our ordering service can achieve up to ten thousand transactions per second and write a transaction irrevocably in the blockchain in half a second, even with peers spread in different continents.

Connected through hyperedge HE-1 (induced by source paper "baash enabling blockchain as a service on high performance computing systems"):
  with members:
    - "sbft a scalable and decentralized trust infrastructure"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"

Connected through hyperedge HE-2 (induced by source paper "streamchain rethinking blockchain for datacenters"):
  with members:
    - "fastfabric scaling hyperledger fabric to 20 000 transactions per second"

Connected through hyperedge HE-3 (induced by source paper "a survey on consensus mechanisms and mining strategy management in blockchain networks"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "information and communications technologies for sustainable development goals state of the art needs and perspectives"
    - "a scale out blockchain for value transfer with spontaneous sharding"
    - "a survey on security and privacy issues of bitcoin"
    - "on cyber risk management of blockchain networks a game theoretic approach"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "competitive data trading in wireless powered internet of things iot crowdsensing systems with blockchain"
    - "blockchained on device federated learning"

Connected through hyperedge HE-4 (induced by source paper "can 100 machines agree"):
  with members:
    - "the consensus number of a cryptocurrency"
    - "sbft a scalable and decentralized trust infrastructure"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "sbft a scalable decentralized trust infrastructure for blockchains"
    - "revisiting fast practical byzantine fault tolerance"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "incremental consistency guarantees for replicated objects"
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-5 (induced by source paper "blockchain powered collaboration in heterogeneous swarms of robots"):
  with members:
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "incentives in ethereum s hybrid casper protocol"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "a survey on the security of blockchain systems"
    - "casper the friendly finality gadget"
    - "the blockchain a new framework for robotic swarm systems"
    - "end to end learning for self driving cars"
    - "cryptocurrencies without proof of work"

Connected through hyperedge HE-6 (induced by source paper "pnyxdb a lightweight leaderless democratic byzantine fault tolerant replicated datastore"):
  with members:
    - "scalable and probabilistic leaderless bft consensus through metastability"
    - "flexible byzantine fault tolerance"
    - "streamchain do blockchains need blocks"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "decentralized applications the blockchain empowered software system"
    - "consensus in the age of blockchains"
    - "exploiting commutativity for practical fast replication"
    - "hardening cassandra against byzantine failures"

Connected through hyperedge HE-7 (induced by source paper "parblockchain leveraging transaction parallelism in permissioned blockchain systems"):
  with members:
    - "fastfabric scaling hyperledger fabric to 20 000 transactions per second"
    - "trusted multi party computation and verifiable simulations a scalable blockchain approach"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "performance benchmarking and optimizing hyperledger fabric blockchain platform"
    - "blockchains consensus protocols in the wild"
    - "adding concurrency to smart contracts"
    - "dgcc a new dependency graph based concurrency control protocol for multicore database systems"
    - "rethinking serializable multiversion concurrency control"

Connected through hyperedge HE-8 (induced by source paper "fastfabric scaling hyperledger fabric to 20 000 transactions per second"):
  with members:
    - "hotstuff bft consensus in the lens of blockchain"
    - "trusted multi party computation and verifiable simulations a scalable blockchain approach"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "how to databasify a blockchain the case of hyperledger fabric"
    - "rcanopus making canopus resilient to failures and byzantine faults"
    - "consensus in the age of blockchains"
    - "blockbench a framework for analyzing private blockchains"

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)