How to sell other people's works from your gallery

Help me please. I want to sell in my gallery not only my NFTs, but also other collectors / authors for a percentage of the sale. How to set up the Cryptovoxel system so that I can see that the visitor has bought NFT by going to opensea from my gallery? Do we have this options?
And one more question. I have a helper and want to give him 10% of the sales, how I can create automatic smart contract for this)?

Hey there.

Unfortunately Cryptovoxels currently has no built-in way to see that the visitor has bought the NFT by going to OpenSea from your gallery, or a way to give 10% of your helper from the sales.

Sorry about that.