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TL;DR: freely. Mining is based on economic incentives. The miners are believed to want to maximize their profits. Therefore because mining a block (finding the right solution to the mining puzzle) is so hard he should include as much transaction to a block as he can because the amount of time processing the extra transactions is insignificant compared to ...


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The Gibabyte Gtx 970 provides hashrate of 22 MHash/s for Ethereum at Coreclock 1563 while consuming 185 watts. for more information check it out given below link : https://miningchamp.com/gpus/38/Gibabyte-Gtx-970-hashrate


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Yes, a new block is validated by all nodes. No, it is not possible for a block with invalid transactions to be part of the main chain. You can mine a block with an invalid transaction. But all the other miners will ignore it.


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Check the inputs of the transactions. I had the same problem. I was giving wrong inputs to the transaction.


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