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Defending PoW Blockchains Against Game-Theoretic DoS Attacks: A Rational Strategy Analysis
- Published
- Record updated
Summary
This paper formalizes game-theoretic denial-of-service (GDoS) attacks on proof-of-work blockchains, unifying selfish-mining and blockchain-based DoS variants under one definition. It models the problem as a dynamic game with a subgame perfect Nash equilibrium and proposes a cooperative hash-power hopping strategy that requires no protocol changes. Simulations calibrated to Bitcoin hash-power distributions show the strategy cuts attacker revenue gains by more than 20% and prevents throughput degradation across the attack range.
Mitigation
Cooperative hash-power hopping: when under attack, miners temporarily reallocate hash power to larger pools to preserve expected payoffs and suppress attacker incentives, without any changes to PoW.