So that is to say once mining becomes more expensive(unless bitcoin prices keep up with the halving) then bitcoin transactions will become less secure as we reach upwards towards the 21 million bitcoins? Is that cap ever going to be restructured? Can you explain shifts that will occur due to NewPowBtc and BTC1 forks? Also will adoption of segwit allow for the fbi to unload its 144,000 bitcoins? I'm a crypto newbie