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: "understanding modern banking ledgers through blockchain technologies future of transaction processing and smart contracts on the internet of money"
  Abstract: In this chapter we provide an overview of the concept of blockchain technology and its potential to disrupt the world of banking through facilitating global money remittance, smart contracts, automated banking ledgers and digital assets. In this regard, we first provide a brief overview of the core aspects of this technology, as well as the second-generation contract-based developments. From there we discuss key issues that must be considered in developing such ledger based technologies in a banking context.

Connected through hyperedge HE-1 (induced by source paper "security analysis methods on ethereum smart contract vulnerabilities a survey"):
  with members:
    - "easyflow keep ethereum away from overflow"
    - "a security case study for blockchain games"
    - "a hybrid formal verification system in coq for ensuring the reliability and security of ethereum based service smart contracts"
    - "finding the greedy prodigal and suicidal contracts at scale"
    - "ethir a framework for high level analysis of ethereum bytecode"
    - "formal process virtual machine for smart contracts verification"
    - "scilla a smart contract intermediate level language"
    - "empirical vulnerability analysis of automated smart contracts security testing on blockchains"

Connected through hyperedge HE-2 (induced by source paper "blockchains a systematic multivocal literature review"):
  with members:
    - "blockchain technology overview"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "blockchains consensus protocols in the wild"
    - "adding concurrency to smart contracts"
    - "a blockchain based decentralized system for proper handling of temporary employment contracts"
    - "an empirical analysis of smart contracts platforms applications and design patterns"
    - "rollback and forking detection for trusted execution environments using lightweight collective memory"
    - "blockbench a framework for analyzing private blockchains"

Connected through hyperedge HE-3 (induced by source paper "blockchain and the future of the internet a comprehensive review"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"
    - "an experiment in distributed internet address management using blockchains"
    - "betrayal distrust and rationality smart counter collusion contracts for verifiable cloud computing"
    - "when the cookie meets the blockchain privacy risks of web payments via cryptocurrencies"
    - "securing vehicle to vehicle communications using blockchain through visible light and acoustic side channels"
    - "blockchain in internet of things challenges and solutions"
    - "online social networks threats and solutions"

Connected through hyperedge HE-4 (induced by source paper "securing the internet of things in the age of machine learning and software defined networking"):
  with members:
    - "quality of information in mobile crowdsensing survey and research challenges"
    - "learning to detect and mitigate cross layer attacks in wireless networks framework and applications"
    - "iot sentinel demo automated device type identification for security enforcement in iot"
    - "low power wide area networks an overview"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "device fingerprinting in wireless networks challenges and opportunities"
    - "incentive mechanisms for participatory sensing survey and research challenges"
    - "a survey on truth discovery"

Connected through hyperedge HE-5 (induced by source paper "transaction propagation on permissionless blockchains incentive and routing mechanisms"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "dandelion redesigning the bitcoin network for anonymity"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "optimal selfish mining strategies in bitcoin"
    - "bitcoin ng a scalable blockchain protocol"
    - "deanonymisation of clients in bitcoin p2p network"
    - "on subversive miner strategies and block withholding attack in bitcoin digital currency"
    - "cryptocurrencies without proof of work"

Connected through hyperedge HE-6 (induced by source paper "blockchain based smart contracts applications and challenges"):
  with members:
    - "a first look at identity management schemes on the blockchain"
    - "smart contract slas for dense small cell as a service"
    - "blockchain based smart contracts a systematic mapping study"
    - "secure and trustable electronic medical records sharing using blockchain"
    - "towards an ontology driven blockchain design for supply chain provenance"

Connected through hyperedge HE-7 (induced by source paper "a case study for grain quality assurance tracking based on a blockchain business network"):
  with members:
    - "a perspective on blockchain smart contracts reducing uncertainty and complexity in value exchange"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"

Connected through hyperedge HE-8 (induced by source paper "a survey on feasibility and suitability of blockchain techniques for the e voting systems"):
  with members:
    - "a survey on security and privacy issues of bitcoin"

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.CY(Computers and Society)