Again, the blockchain can positively tell you that the data (whether it’s just a reference to the image or the image itself) was put there by a specific person that had the keys to a specific address. If that address is associated with the artist, then the artist (or someone with their private keys) put it there. Depending on who that person is, it can add value. This NFT by Beeple [1] just sold for $70 million. Something tells me that your copy, which will not have been put on the blockchain by an address associated with Beeple, won’t fetch the same price.

[1] https://apnews.com/article/beeple-nft-christies-record-sale-...