How will the BTC mining difficulty level affect validators (btc miners) due to 1/2 reduction in reward after the next halving and possible backlash on general ecosystem?
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Those for whom mining BTC is a serious business started to adapt for the next halving already after the last halving, because that's what professionals who protect their investments do - and those who are ordinary amateurs are, as always, doomed to failure, in any business. I don't know if you are aware that for the first four years the reward per block was 50 BTC, and now it is only 6.25 BTC - considering your thinking, the whole thing should have failed a long time ago.
It would be good if you could explain to us exactly what you meant when you said
"possible backlash on general ecosystem", because I don't see any sense in what you wrote in relation to halving and Bitcoin.
The use of capital letters has its own meaning, so it makes no sense for the title to be in that format in the future.