When i used bitcoin I started from hyip's, then a friend introduced me to altcoin trading and I have been trading now for more than a year... I have also tried gambling but not lucky enough to gamble...  There are a lot of source to earn bitcoin and signature campign is new to me... Good source of earning bitcoin since u don't need invest money... But still my number one source of bitcoin is from trading (altcoins)... Just do some research before trading...