There’s a blockchain for that


... At root, the blockchain is all about replacing the servers that power today’s online world with computing power and storage that we all share. Every network requires what programmers call a “single source of truth” — the authority that says, “this is real,” “this user is who she claims to be,” “this transaction occurred.” To date, we have depended on servers run by corporations and governments to provide our single sources of truth. Even the Internet itself uses a handful of root servers to make the domain-name system work.