Actually yes, the signature itself is basically an NFT, anything unique is actually an NFT.
The initial idea was to convert the old Bitcoin addresses into NFT, but the problem is that Private Key is owned by the old owner and the new owner, so to solve this problem (OP) developed the idea to make an NFT from the signature chain.
yhiaali3, testing 'signature chain' .. it works

I have address 1MAP7AKiN5Ddce82VE8eFheFfyQ8iffvmV prepared for a 'signature chain'. If you like, post an empty legacy address (starting with 1..) and I would transfer it to you. Then you are one of the first 'signature chain' owners

Of course only if you like.