[perf1]

Kevin O'Leary from Shark Tank pushes for a sustainable Bitcoin. His proposed solution is to have basically "certified" Miners mine clean Coins and never exchange them. Of course if this takes over Bitcoin isn't really decentralized anymore, but he thinks Institutional Investors would prefer that.

[danbruc]

If you are willing to do that, then make them certified ledger maintainers and throw out the entire mining overhead and make them use a good old SQL database. Sprinkle as much cryptography on top of that as you want to feel happy about unforgeability and such. The only reason to have a mining process is to allow anonymity, when you give up on that, mining becomes pointless. Also Bitcoin has not been decentralized for a long time, the idea that every Bitcoin user gets a vote in the consensus process went out the window a decade ago.