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: "betrayal distrust and rationality smart counter collusion contracts for verifiable cloud computing"
  Abstract: Cloud computing has become an irreversible trend. Together comes the pressing need for verifiability, to assure the client the correctness of computation outsourced to the cloud. Existing verifiable computation techniques all have a high overhead, thus if being deployed in the clouds, would render cloud computing more expensive than the on-premises counterpart. To achieve verifiability at a reasonable cost, we leverage game theory and propose a smart contract based solution. In a nutshell, a client lets two clouds compute the same task, and uses smart contracts to stimulate tension, betrayal and distrust between the clouds, so that rational clouds will not collude and cheat. In the absence of collusion, verification of correctness can be done easily by crosschecking the results from the two clouds. We provide a formal analysis of the games induced by the contracts, and prove that the contracts will be effective under certain reasonable assumptions. By resorting to game theory and smart contracts, we are able to avoid heavy cryptographic protocols. The client only needs to pay two clouds to compute in the clear, and a small transaction fee to use the smart contracts. We also conducted a feasibility study that involves implementing the contracts in Solidity and running them on the official Ethereum network.

Connected through hyperedge HE-1 (induced by source paper "an overview on smart contracts challenges advances and platforms"):
  with members:
    - "the art of the scam demystifying honeypots in ethereum smart contracts"
    - "blockchain for internet of things a survey"
    - "evmfuzz differential fuzz testing of ethereum virtual machine"
    - "tool demonstration fsolidm for designing secure ethereum smart contracts"
    - "finding the greedy prodigal and suicidal contracts at scale"
    - "ethir a framework for high level analysis of ethereum bytecode"
    - "sabre protecting bitcoin against routing attacks"
    - "hunting the ethereum smart contract color inspired inspection of potential attacks"

Connected through hyperedge HE-2 (induced by source paper "generic superlight client for permissionless blockchains"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "fraud and data availability proofs maximising light client security and scaling blockchains with dishonest majorities"
    - "computational extensive form games"
    - "sequential equilibrium in computational games"
    - "on bitcoin and red balloons"

Connected through hyperedge HE-3 (induced by source paper "a survey on applications of game theory in blockchain"):
  with members:
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "security services using blockchains a state of the art survey"
    - "blockchain governance game"
    - "exchange of renewable energy among prosumers using blockchain with dynamic pricing"
    - "game of coins"
    - "delayed blockchain protocols"
    - "reward sharing schemes for stake pools"
    - "a survey on the security of blockchain systems"

Connected through hyperedge HE-4 (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"
    - "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"
    - "understanding modern banking ledgers through blockchain technologies future of transaction processing and smart contracts on the internet of money"
    - "online social networks threats and solutions"

Connected through hyperedge HE-5 (induced by source paper "securely trading unverifiable information without trust"):
  with members:
    - "a scalable verification solution for blockchains"
    - "water from two rocks maximizing the mutual information"
    - "astraea a decentralized blockchain oracle"
    - "smart contract templates essential requirements and design options"
    - "informed truthfulness in multi task peer prediction"
    - "crowdsourced judgement elicitation with endogenous proficiency"
    - "a new approach to practical active secure two party computation"

Connected through hyperedge HE-6 (induced by source paper "outsourcing computation the minimal refereed mechanism"):
  with members:
    - "a scalable verification solution for blockchains"
    - "computational extensive form games"
    - "algorithmic rationality game theory with costly computation"

Connected through hyperedge HE-7 (induced by source paper "silentdelivery practical timed delivery of private information using smart contracts"):
  with members:
    - "decentralized release of self emerging data using smart contracts"
    - "deanonymisation of clients in bitcoin p2p network"

Connected through hyperedge HE-8 (induced by source paper "decentralized privacy preserving timed execution in blockchain based smart contract platforms"):
  with members:
    - "decentralized release of self emerging data using smart contracts"
    - "zero collateral lotteries in bitcoin and ethereum"

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)