Many have heard of the famous cryptocurrency named Bitcoin, but many have not heard of blockchain. Blockchain is the underlying technology that allows Bitcoin to function as a decentralized currency. Imagine blockchain as a shared database. Unlike the Cloud, where Google or Apple control all the data, a public blockchain is not controlled by a central authority. Instead, anyone connected to the internet can take part in storing the data. Because it is not controlled by one party, theoretically, a blockchain cannot be shut down, hacked, and most importantly, the data cannot be altered again. Cryptocurrencies are one tiny possibility of the power of blockchain.