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I am new to blockchain and ethereum. I created a private network with two nodes, I have couple of questions:

  1. After starting the miner it starts mining even if there is no transaction performed. So what is the miner mining and what is the significance of it?
  2. When I transfer some ether to another using the mist wallet it says it is pending 12 approvals, how we reach to this figure of 12 approvals, is it configurable.?

TIA

  • For answer to first part of your question please see ethereum.stackexchange.com/questions/6648/… – Alan Buxton Jul 27 '17 at 7:03
  • And part two is answered here – Joe Jul 27 '17 at 14:14
  • Hi there. To avoid duplication in other people posting answers, and to prevent this question going stale (because it's been answered in the comments), I'm going to flag it as a duplicate (to the first answer pointed to in the comments). – Richard Horrocks Jul 27 '17 at 17:41
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For the answer of your first question :-
Miners produce blocks which are checked for validity by other participating nodes. The process of finalizing a block during mining involves following steps:-
1. Determine Uncles
2. Determine and process Transactions
3. Apply mining Rewards
4. Compute mining proof of work(POW)

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