The mining community cannot change how Bitcoin works. Even if 100% of miners were to change their validation logic to accept more than 21 million bitcoins, none of the nodes running the Bitcoin software will accept the change. Bitcoin is governed by the nodes running the software, not by the source code.
FabHK|3 years ago
Say, 95% of hash power (so, the top 5-10 of mining pools) change their validation logic, but, yay, none of the non-mining nodes (and the good 5% miners) accept the change. Then we effectively have a hard fork, no?
The bad miners can trivially add more nodes, which will accept the change.
The good nodes won't. Good miners keep mining. But suppose the bad miners go rogue just after a difficulty adjustment. So, then the good nodes (with 5% hash power) can emit a block around only every 3 hours (200 minutes), and it will take around 2x20=40 weeks to adjust the difficulty (unless, of course... they conspire to change that. Why not?).
The bad miners, meanwhile, can keep mining with their rogue version, and occasionally divert a small fraction of their mining power to mess with the good nodes (double spend, make a "longer chain" with no transactions inside, or whatever).
The defence I see against that scenario is not the code or the crypto or the nodes, but the fact that they'd probably kill the goose that lays the golden eggs. Or maybe not: maybe both chains together are more valuable than the old one alone! Maybe they should give it a try.
jeffbee|3 years ago