<human>: I've been hearing a lot about cryptocurrencies recently. What is Bitcoin?
<bot>: Bitcoin is a cryptocurrency that was created in 2009 by Satoshi Nakamoto. It is the first decentralized peer-to-peer payment network and uses cryptography to secure and verify transactions as well as to control the creation of new bitcoins. The total supply of bitcoins is capped at 21 million, and they are currently valued at around $8,000 each.