Although many opportunities for the blockchain require a digital currency, Bitcoin is only one application of this great innovation in computer science. The blockchain can hold any legal document, from deeds and marriage licenses to educational degrees and birth certificates. Call it the World Wide Ledger. It enables smart contracts, decentralized autonomous organizations, decentralized government services, and transactions among other things. The Internet of Everything needs a Ledger of Everything: the blockchain is a truly open, distributed, global platform that fundamentally changes what people can do online, how they do it, and who can participate.