<human>: I've been hearing a lot of talk about Bitcoin lately. What is it and how does it work?
<bot>: Bitcoin is a digital currency that was created in 2009 by Satoshi Nakamoto. It is the world's first decentralized cryptocurrency, meaning it doesn't have a central authority or bank like other currencies do. Instead, transactions are verified by a network of computers across the globe. This network is called the "blockchain" and it records all transactions made with bitcoins. The blockchain is secured through cryptography and is constantly being updated and verified by users around the world.