Here’s something I don’t understand. Are NFT’s all on the same blockchain? Otherwise couldn’t someone put the same asset on an alternate blockchain (or even th

Here’s something I don’t understand. Are NFT’s all on the same blockchain? Otherwise couldn’t someone put the same asset on an alternate blockchain (or even the same asset on the same blockchain) and claim its the real one? How then do I know which is the right one to buy? For something like Jack’s Tweet #1 it’s gotten a lot of press so maybe I would know. But for some less popular digital assets, how would I know which blockchain/version is the ‘right’ one for that asset? Do we need the NFT equivalent of Twitter blue checks?