I'm new to bitcoins. I've red a lot of topics here, but still, I never clearly knew why do you actually need blockchain to use bitcoin and how it influences bitcoin? Also, how does mining actually work? Since I got a video card, would it be any profitable to mine today without special cards?
The blockchain is like an open ledger of all Bitcoin transactions. It permanently records all transactions and the amount in each wallet and address and the history of all transactions. Blockchain could also be described as the platform that Bitcoin functions on.