  This paper deals with the design of the secure blockchain network framework
to prevent damages from an attacker. The decentralized network design called
the Blockchain Governance Game is a new hybrid theoretical model and it
provides the stochastic game framework to find best strategies towards
preparation for preventing a network malfunction by an attacker. Analytically
tractable results are obtained by using the fluctuation theory and the mixed
strategy game theory. These results enable to predict the moment for operations
and deliver the optimal portion of backup nodes to protect the blockchain
network. This research helps for whom considers the initial coin offering or
launching new blockchain based services with enhancing the security features.

Cryptography and Security;Computer Science and Game Theory;Optimization and Control