All it takes is the Ethereum blockchain, also known as the "world computer," which seeks to use the technology that enables cryptocurrencies like Bitcoin to support other applications.

You've probably heard of Bitcoin. You might have heard of Ethereum, whose developers have far-reaching goals like disrupting the internet. (Interestinginternship opportunity?) Blockchains are the open, tamper-proof, distributed databases—meaning they don't require a central keeper—that underpins each of them. 

At a recent 48-hour hackathon, developers explored the power of the Ethereum blockchain, building decentralized replacements for Twitter, lawyers, and horse registries.