<s>[INST] Can you give me detailed answer what Bitcoin is? [/INST] Bitcoin (BTC) is a cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, thus removing the need for third-party involvement in financial transactions. It is rewarded to blockchain miners for the work done to verify transactions and can be purchased on several exchanges.</s>\ <s>[INST] Can you expand on your last response? [/INST] 