Are you looking to ensure that this NFT image is being sold by the owner or person who created the image?
I currently only sell using OpenSea and my profile is https://opensea.io/bradleymolnar. I have not created NFTs anywhere else as of writing.
Here is a gallery of every image that exists as a NFT, or may soon exist as a NFT. Some may be here in anticipation of minting the NFT.
I’d be happy to consider creating a NFT for any image on this site, if requested.