Hi everyone,
I need to know
how can proof, in the future max number of bitcoins stay constant?
how can proof, by change bitcoin algorithm max number of bitcoins stay constant?
The only way to change the max supply is by conducting a hard fork. The majority of the nodes will have to accept the new rules, otherwise it'll end up as a minority chain. There is 0% chance that the majority of the nodes will support a change like that.