2. Post a picture of the item you want to sell, along with your username and date/Block height next to the item. This helps to verify you actually have the item you want to sell.
A warning for buyers: you should not rely on this (anymore) as proof of ownership. It has happened at least once that someone fell for a scammer's request to write the scammer's username on the picture:rajubhusal asked djjacket to put his (raj) name on the image. he then used that image as "proof" to eseayan of "ownership"
Really sorry this happened to you eseayan.You have single-handedly made this entire concept useless by doing this:
(screenshot taken by LoyceV from this link)