The backbone of cryptocurrency is blockchain, and it takes many computers working in parallel to create a secure, working cryptocurrency. Behind many of the most popular currencies, including Bitcoin and Litecoin, is an algorithm called proof of work (PoW). Under proof of work, computers around the world called miners compete against each other to solve complex equations. The winner can verify the next block of transactions and earns a reward. If you have a spare computer at home, you can tur...