bitcoinClean is a hard fork of Bitcoin at block #517.799. Block #518,800 will be the first bitcoinClean block. bitcoinClean introduces an additional restriction for miners, so that only miners, that have submitted a proof-of-greenness, or documentation, about their clean electricity use, that has been approved by their peers can mine coins.
bitcoinClean aims to overcome the issue of vast energy consumption with high carbon emissions for mining digital currencies by exclusively using renewable energy. Therefore bitcoinClean introduces the proof-of-greenness protocol to verify the use of green energy.