What happens in 2140 when the last BTC was mined with the confirmations of the transactions in the blocks and thus with the block rewards. There should not be more BTC than Rewards, because 21 Mill BTC were gemined.
How are the transactions then confirmed?
I don't understand this question.
but what I think for you, the question is, are you still there in 2140? we will never know what will happen in the future. and until now bitcoin still has not reached its maximum supply, in other words can still be mined.