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: "blockmania from block dags to consensus"
  Abstract: Blockmania is a byzantine consensus protocol. Nodes emit blocks forming a directed acyclic graph (block DAG) that is subsequently interpreted by each node separately to ensure consensus with safety, liveness and finality. The resulting system has communication complexity $O(N^2)$ even in the worse case, and very low constant factors --- as compared to $O(N^4)$ for PBFT; it is leaderless; and network operations do not depend on the composition of the quorum or node stake. This makes Blockmania very efficient (leading to over 400K transactions per second on a wide area network), and ideal for dynamic membership and flexible and non-interrupted proof-of-stake protocols. A X-Blockmania variant, has $O(N)$ communication cost but also higher latency $O(\log N)$.

Connected through hyperedge HE-1 (induced by source paper "sok tools for game theoretic models of security for cryptocurrencies"):
  with members:
    - "oceanic games centralization risks and incentives in blockchain mining"
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "selfish mining in ethereum"
    - "impossibility of full decentralization in permissionless blockchains"
    - "squirrl automating attack discovery on blockchain incentive mechanisms with deep reinforcement learning"
    - "an axiomatic approach to block rewards"
    - "reward sharing schemes for stake pools"
    - "compounding of wealth in proof of stake cryptocurrencies"

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"
    - "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"
    - "on reducing the complexity of matrix clocks"
    - "secure history preservation through timeline entanglement"

Connected through hyperedge HE-3 (induced by source paper "stairdag cross dag validation for scalable bft consensus"):
  with members:
    - "onlay online layering for scalable asynchronous bft system"
    - "stakedag stake based consensus for scalable trustless systems"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "opera reasoning about continuous common knowledge in asynchronous distributed systems"
    - "algorand the efficient and democratic ledger"
    - "cryptocurrencies without proof of work"
    - "randomized protocols for asynchronous consensus"

Connected through hyperedge HE-4 (induced by source paper "aleph efficient atomic broadcast in asynchronous networks with byzantine nodes"):
  with members:
    - "dfinity technology overview series consensus system"
    - "the latest gossip on bft consensus"
    - "blockchains consensus protocols in the wild"
    - "casper the friendly finality gadget"
    - "revisiting fast practical byzantine fault tolerance"

Connected through hyperedge HE-5 (induced by source paper "stakedag stake based consensus for scalable trustless systems"):
  with members:
    - "onlay online layering for scalable asynchronous bft system"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "cryptocurrencies without proof of work"
    - "randomized protocols for asynchronous consensus"

Connected through hyperedge HE-6 (induced by source paper "streamnet a dag system with streaming graph computing"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"

Connected through hyperedge HE-7 (induced by source paper "opera reasoning about continuous common knowledge in asynchronous distributed systems"):
  with members:
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "algorand the efficient and democratic ledger"
    - "randomized protocols for asynchronous consensus"

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)