Valuables - Buy and sell tweets autographed by their creators.

You can try and buy my tweet here: https://v.cent.co/tweet/63959683...

Yep, let's make this tweet to $1B - https://t.co/eRgOInWGct?amp=1

What a fun application of NFTs, haha :) Serious question; what prevents someone from minting another token (outside of Valuables) that is also connected to the same tweet?