human
I've been hearing a lot of buzz about Bitcoin. What is it?
assistant
Bitcoin is a digital currency that was created in 2009 by Satoshi Nakamoto. It's based on blockchain technology, which is a type of distributed ledger system that records transactions made with the currency. Transactions are verified by network nodes and recorded in a public ledger, or "blockchain", making it virtually impossible to counterfeit or double-spend bitcoins.