A blockchain is a history of every transaction ever made on it. To make sure it is accurate (PoW) cryptos use hashing power (they solve equations basically). Th

A blockchain is a history of every transaction ever made on it. To make sure it is accurate (PoW) cryptos use hashing power (they solve equations basically). This is where "mining rigs" come into play but are only a small part of a broader ecosystem :) They don't really "bring" value in (nothing really does actually), that's entirely up to what the consumer is willing to pay for it (what HE values it at) EDIT: sorry about the cryptos=cryptocurrencies thing :S