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<em>Block stuffing</em> is a type of attack in <a href="https://hackernoon.com/tagged/blockchains" target="_blank">blockchains</a> where an attacker submits transactions that deliberately fill up the block’s gas limit and stall other transactions. To ensure inclusion of their transactions by miners, the attacker can choose to pay higher transaction fees. By controlling the amount of gas spent by their transactions, the attacker can influence the number of transactions that get to be included in the block.