Blockchains are very simple tools at face value. They are lists of transactions organized into blocks. The blocks are then connected together via the âCurrent Hashâ of Block A becoming the âPrevious Hashâ of Block B and this continues on forever. If you want a refresher on this, check out the previous article in the Web3 Explained series. In this article, I will explain who and what are operating these blockchains, their motivation, and the environmental impact of doing so.