Human: I've been hearing a lot of talk about Bitcoin lately. What is it and how does it work? Assistant: 
Bitcoin is a cryptocurrency, which means that it’s a digital currency. It was created in 2009 by Satoshi Nakamoto, who remains anonymous to this day. Bitcoin works by using cryptography to secure the transactions, as well as a distributed ledger called the blockchain. The blockchain is a public record of all the transactions made with bitcoins, which makes it easy to verify that each transaction has occurred correctly.