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We use historical data to estimate the potential benefit of speculative techniques for executing Ethereum smart contracts in parallel. We replay transaction traces of sampled blocks from the Ethereum blockchain over time, using a simple speculative execution engine. In this engine, miners attempt to execute all transactions in a block in parallel, rolling back those that cause data conflicts. Aborted transactions are then executed sequentially. Validators execute the same schedule as miners. Wedoi:10.4230/oasics.tokenomics.2019.4 dblp:conf/tokenomics/SaraphH19 fatcat:ijqcne4zqraj3gihncftx446ce