human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "on the ethereum blockchain structure a complex networks theory perspective"):
  Abstract: In this paper, we analyze the Ethereum blockchain using the complex networks modeling framework. Accounts acting on the blockchain are represented as nodes, while the interactions among these accounts, recorded on the blockchain, are treated as links in the network. Using this representation, it is possible to derive interesting mathematical characteristics that improve the understanding of the actual interactions happening in the blockchain. Not only, by looking at the history of the blockchain, it is possible to verify if radical changes in the blockchain evolution happened.

Includes members:
  Member "likestarter a smart contract based social dao for crowdfunding":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "are distributed ledger technologies ready for smart transportation systems")
  Member "towards blockchain enabled wireless mesh networks":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "distributed access control with blockchain")
  Member "a blockchain based flight data recorder for cloud accountability":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "are distributed ledger technologies ready for smart transportation systems")
  Member "towards blockchain based auditable storage and sharing of iot data":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "iot expunge implementing verifiable retention of iot data")
  Member "smart contract slas for dense small cell as a service":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "smart contract based secure spectrum sharing in multi operators wireless communication networks")
  Member "a blockchain based approach for data accountability and provenance tracking":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "joint time scheduling and transaction fee selection in blockchain based rf powered backscatter cognitive radio network")
  Member "highly intensive data dissemination in complex networks":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "agent based simulation of blockchains")
  Member "simulation of the internet of things":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "are distributed ledger technologies ready for smart transportation systems")

Question: Please tell me which class the source paper 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)