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No, this 'NFT' is a bit different but it works. Again, read the 'how it works'
https://bitcointalksearch.org/topic/old-bitcoin-addresses-as-nft-on-the-bitcoin-blockchain-signature-chain-5425241The idea behind that is a 'signature transfer chain' that can only work if the private key holder/owner of the initial address signs a 'transfer message'.
Thereafter the initial owner can't sign a valid transfer message (we won't accept it as valid) as the 'transfer transaction' to the new owner will indicate the transfer of ownership.
So there will be exactly one owner at a given time who owns it and can transfer it.
wrong
because "onesignature" for example signed that
1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
now belongs to
1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
and then
1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
signed that it now belongs to
1KN59gRxD8G9g9smSLTFt9aSgWxYxTzFL7
.. in your mind.. right?
however..
NOTHING stops the owner of the original
1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
from signing to someone else
also the value of getting your address signed by
1KN59gRxD8G9g9smSLTFt9aSgWxYxTzFL7
has not the same value as seeing your address signed by
1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
..
like i said before
imagine elvis is: 1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
and signed "i love stacey" 1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
and stacy signed "i love jeff 1KN59gRxD8G9g9smSLTFt9aSgWxYxTzFL7
jeffs autograph is not as important as a real signature from elvis to you
no one wants jeff. and jeff has not signature from elvis himself
..
now here is one other thing.
altough this scenario is suggesting that in 2022 elvis signed a the first chain letter to stacey. we all know elvis is dead. so the autograph to stay has less value because we dont know if it was actually elvis signing it or someone just using his pen..
and again.. you are not even selling elvisis pen(privkey) you are just letting jeff sell a chain letter of love to someone.