What's a non-fungible token and should the French art world be worried?

An art gallery in Paris is showing and selling things called non-fungible tokens of digital art. Basically, the buyer gets a code for his money, and that code gives him unique individual access to a work of art. Will NFTs, as the codes are called, become the next big thing in the art world, or are they just a speculative tool to make money – or both?
http://dlvr.it/SbzM1W

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