I always embroider my name and year it was quilted on the bottom right hand of the right side of the wallhanging etc. I make a label on the back with the name of the wallhanging. I also have a file where I write all about my quilts/wallhangings. I state who I gave it to, what the occasion was, which fabrics I used and why etc etc. I have never sold any of my handwork. My handwork has always been as a gift.
I would definetely sign my name and the year if I sold anything. It is your legacy and something you should be proud of... have a great day.