Block interception is a typical attack method in the blockchain. It enters the mine pool through computational power, but never sends the full workload proof, only the revenue of the mine pool is shared. In response to this problem, this paper first summarizes the typical attacks of blockchains, and analyzes the principle of block interception attacks and the impact on the mine pool. In order to improve the safety of the mine, a special reward for miners that provides a complete proof of work is provided to reduce the expected profit of the attacker. Finally, the relationship between the size of the special reward and the additional income when the attack is launched is analyzed through experiments.
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