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As we know, propagation of a new block in blockchain network has some delay and so some nodes receive the new block later. so if it is that the first one who finds the nonce properly wins the block can we say that the mechanism of mining is not fair enough (Because of delay in propagation of a block some blocks receive the block sooner and have more time to calculate the nonce)?
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Considering that a block is mined on average every 10 minutes and that the average time to propagate to all nodes is 12.6 seconds, I think it is pretty fair.
We could also guess that the big miner have incentives to get the newly mined hash very fast so it must be lower than 12.6 for them.
I edited the question to explain more, I think you didn't get my reasoning exactly. @Saxtheowl – ShakibaZar – 2019-11-26T11:30:29.643
I don't understand the reasoning in your question. – Pieter Wuille – 2019-11-25T14:56:06.883
I edited the question and added the bold sentence to explain the reasoning. @PieterWuille – ShakibaZar – 2019-11-26T11:29:43.010