"Collectible" is the first step to get a Trackable item added to a digital inventory place called "Collection", mostly so that it doesn't clutter an Inventory list.  It is done with publicly available logs, so all can see who owns it and whose "Collection" you allow it in.  It's all above-board and of course only for honest cachers.  They don't "steal it", your coin belongs to you regardless of any menu setting at all.  But you can logit into your Collection or the friend can place it into in th