You could have done that in 1979 with a Merkle tree for a tiny fraction of the cost.
Also, since the NFT does not, in fact, contain the text of your work, unless your work is very tiny, it isn't immortalizing anything.
Why would people in the future pay money for your work if people today won't?
The worst is this: I have written considerable code in one of the blockchains - XRP. I have a degree in mathematics, and I have been writing computer programs for decades now.
From looking at your resumé, I'll bet you couldn't write a computer program or do arithmetic in a finite field in your life!
And yet here you are, telling me I have no idea what I am talking about - when it's absolutely clear it is you that has no understanding at all of the technology.
What absolute nerve! It's Dunning-Kruger, of course: your complete lack of understanding of this field allows you to believe that you know more than a professional in the field.
I won't wish you good luck with your ridiculous fantasies, because they are selfish and destructive to the world, and because you were rude to me, a total stranger who has never communicated with you before, because I disagreed with your delusional and completely uneducated beliefs.
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Actually, in retrospect it makes me feel sad. You're so desperate to make money from your writing, and you want to believe that buying into this ridiculous Ponzi scheme will somehow make your grandchildren rich - that people will magically give them money because you once filled out a form online.