BTC is the first successful digital cryptocurrency created by anonymous Satoshi Nakamoto year 2009 compare to other altcoins BTC is a legit coin it is made as a new mode of payment while some altcoins are scams but mostly they project themselves as better substitutes to Bitcoin. you can also search for further information on Youtube on how BTC works or just read everything here in the forum. Actually, I learn 70% of everything I know in BTC here in the forum.