Proof of labor (PoW): During this protocol, the new node has to solve a cryptographic puzzle. It requires locating a nonce corresponding to a hash in keeping with the community’s criteria. The initial node to accomplish the puzzle joins the network. This protocol is Employed in Bitcoin and Ethereum 1.028. https://juliuslllnr.ssnblog.com/32172530/the-smart-trick-of-role-of-energy-brokers-that-no-one-is-discussing