Pow in Bitcoin. We have seen how the previous Bitcoin consensus algorithm. And already know how it will work safely.
As far as we know so far, the value of the block reward is 25 Bitcoin. At every 210,000 blocks, the reward value will be halved. And it will come down more or less in the next four years. Early on, the block reward is 50 Bitcoin, and has become 25 Bitcoin. And will be reduced by half in the future. Of course, the reduction of this reward will have its own implications later on. We will know the implications and the relationships further.