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Imagine a malminer with two important abilities: having enough hashrate for producing blocks in a single-miner mode in reasonable amount of time and having a malconfigured miner software which doing somewhat a usual mining job, but including no transactions in the block except of reward. It might be more productive (from malminer's point of view) way of converting a computational power into some bitcoins, because changing the nonce only looks much easier than downloading and ledgering the real-world transactions. Can I call such intentional easy-mining a Sybil attack?
I understood your answer as a practical insight, but in this question I'm interested in kind of moot ideas. BTW, I kind of need to go deeper, therefore I decided to ask another question within "mining-theory" for better understanding some theory behind your answer: https://bitcoin.stackexchange.com/questions/57972/what-parts-of-sha-256-hashing-an-asic-miner-really-does-and-what-remains-a-cpu
– Eimrine – 2017-08-12T14:50:50.260