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: "cross blockchain databases for governments the technology for public registries and smart laws"
  Abstract: There is an ongoing competition among blockchain technologies and the existence of one ultimate 10 blockchain is impossible for many reasons. On the other hand, such variety can create difficulties in 11 adoption, especially for the governments and corporations. The proposed technology ensures a 12 blockchain agnostic approach and aimed to create a unified ecosystem of multiple networks. The 13 cross-blockchain protocol can be used to develop services where end-users decide for themselves 14 their most preferred blockchain. The invention solves problems of duplication of tokens in the result 15 of hardforks, issues with scalability, digital identity and even the "problem" of immutability 16 (enforceability). A cross-blockchain DB means a consistent non-conflicting key-value database 17 across a bunch of defined blockchains. It is not a new blockchain, but a protocol for developing 18 databases on existing blockchains. The protocol is also a basis for a "smart law" which is a 19 framework for public registries and their governance.

Connected through hyperedge HE-1 (induced by source paper "constraints and benefits of the blockchain use for real estate and property rights"):
  with members:
    - "is blockchain hashing an effective method for electronic governance"

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)