What is Consensus?
Consensus is a group decision making process in which group members develop, and agree to support a decision in the best interest of the whole, ie general agreement. The key innovation is the ability to come to "consensus" on the state of data despite the absence of a central controlling party. The main approaches to achieving consensus with regard to blockchain include, proof of work (solving complex mathematical puzzle), proof of stake (risking your tokens), and proof of space time( verifying file storage. The consensus process ensures that every token is a scarce asset and that the distributed ledger is up to date and accurate.