Ethereum

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Finality in blockchain consensus

Is Absolute/ Immediate Finality a goal in blockchain consensus or does some areas work better under probabilistic finality such as Ethereum's Pow and to be PoS? (I know that some networks using BFT ...
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Which consensus algorithm (POW or POA) is better for private blockchain?

POW requires lots of computational power so as the chain grow long we will need more computational power which is not required for private blockchain.... On the other hand, POA is looking better ...
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PoA network confusion resolving using geth

I am planning to move from PoW to PoA consensus (clique) using geth. But I am confused of some of the topics - 1) Empty blocks are created periodically? What is the size of an empty block? 2) Is it ...