first of all i don't think that exists a method to earn a lot of free bitcoin and fast, just do your work and use your skills, good luck
It does exist.
If you found yourself enjoying any kind of bitcoin earning method you know and you are receiving a nice and decent profit every week then you can considered it as a fast earnings since you are making a fixed weekly "sure" income here.
That's true and signature campaign is allowing us to do so, as we are earning weekly income in the form of bitcoins, and the income is assured and safe, and you can make a descent earnings from signature campaigns.