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There is no standard on Hive, in fact it was never done before. But I followed a similar system you would see on ETH.

Okay. I was thinking it was a general standard that they were trying to do with NFT collections to show the attributes match the image.

I found the NFT Marketplace wiki that was made by the guys who do Splinterlands.

Now I understand what that guy meant in the video, it is the format for the Etherum token. Hive/Steem has its own format for handling the data.