Sellers are required to confirm profile link (Steam 64 ID) with buyer before trading, and provide two screenshots (before and after trade) as proof of delivery. In the event of a trading dispute, we may decide in favor of the buyer if seller fail to provide either one of the required details. Sellers may also use video recording in place of screenshots.
Steam profile link is steam64 ID, can be found at https://steamid.xyz/ .
For example