I always put a label on my quilts, but never thought of a signature. What a great idea. It might not mean much now, but should the quilt survive 100 yrs., I think those who possess it would be happy to have not only the information from the label, but also a signature to 'authenticate' it. When I see old quilts, I would love to know the history, and enjoy imagining what the quilter was like, how she lived, the occasion for making the quilt. I will never be famous, but with my quilts, I will be known by somebody in the distant future. That feels kind of good.