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: "blockchain meets database design and implementation of a blockchain relational database"
  Abstract: In this paper, we design and implement the first-ever decentralized replicated relational database with blockchain properties that we term blockchain relational database. We highlight several similarities between features provided by blockchain platforms and a replicated relational database, although they are conceptually different, primarily in their trust model. Motivated by this, we leverage the rich features, decades of research and optimization, and available tooling in relational databases to build a blockchain relational database. We consider a permissioned blockchain model of known, but mutually distrustful organizations each operating their own database instance that are replicas of one another. The replicas execute transactions independently and engage in decentralized consensus to determine the commit order for transactions. We design two approaches, the first where the commit order for transactions is agreed upon prior to executing them, and the second where transactions are executed without prior knowledge of the commit order while the ordering happens in parallel. We leverage serializable snapshot isolation (SSI) to guarantee that the replicas across nodes remain consistent and respect the ordering determined by consensus, and devise a new variant of SSI based on block height for the latter approach. We implement our system on PostgreSQL and present detailed performance experiments analyzing both approaches.

Connected through hyperedge HE-1 (induced by source paper "trends in development of databases and blockchain"):
  with members:
    - "chainifydb how to blockchainify any data management system"
    - "sok of used cryptography in blockchain"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "vchain enabling verifiable boolean range queries over blockchain databases"
    - "ipfs content addressed versioned p2p file system"

Connected through hyperedge HE-2 (induced by source paper "scaling hyperledger fabric using pipelined execution and sparse peers"):
  with members:
    - "fastfabric scaling hyperledger fabric to 20 000 transactions per second"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "towards scaling blockchain systems via sharding"

Connected through hyperedge HE-3 (induced by source paper "blockchains and distributed databases a twin study"):
  with members:
    - "atomic commitment across blockchains"
    - "cross chain deals and adversarial commerce"
    - "chain of trust can trusted hardware help scaling blockchains"
    - "blockchain technology overview"
    - "performance evaluation of the quorum blockchain platform"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "towards scaling blockchain systems via sharding"
    - "atomic cross chain swaps"

Connected through hyperedge HE-4 (induced by source paper "proof of execution reaching consensus through fault tolerant speculation"):
  with members:
    - "vchain enabling verifiable boolean range queries over blockchain databases"
    - "towards scaling blockchain systems via sharding"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "the gap game"
    - "proof of work without all the work"
    - "blockbench a framework for analyzing private blockchains"
    - "revisiting fast practical byzantine fault tolerance"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"

Connected through hyperedge HE-5 (induced by source paper "scaling blockchain databases through parallel resilient consensus paradigm"):
  with members:
    - "mir bft high throughput bft for blockchains"
    - "vchain enabling verifiable boolean range queries over blockchain databases"
    - "towards scaling blockchain systems via sharding"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "blockbench a framework for analyzing private blockchains"
    - "revisiting fast practical byzantine fault tolerance"

Connected through hyperedge HE-6 (induced by source paper "the economics of smart contracts"):
  with members:
    - "incentives in ethereum s hybrid casper protocol"
    - "empirically analyzing ethereum s gas mechanism"
    - "broken metre attacking resource metering in evm"
    - "an adaptive gas cost mechanism for ethereum to defend against under priced dos attacks"
    - "casper the friendly finality gadget"

Connected through hyperedge HE-7 (induced by source paper "chainifydb how to blockchainify any data management system"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "towards scaling blockchain systems via sharding"
    - "accelerating analytical processing in mvcc using fine granular high frequency virtual snapshotting"
    - "logbase a scalable log structured database system in the cloud"

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)