Recently there was a post with signatures, that used a key of a very old (January 2009) Bitcoin address.

Quote from: OneSignature on November 28, 2022, 01:30:19 AM

Quote from: OneSignature on November 26, 2022, 11:23:02 PM

This is the oldest signature

(please post if you have a signature with an older address)

Quote

-----BEGIN BITCOIN SIGNED MESSAGE-----
1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
-----BEGIN SIGNATURE-----
1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
HCsBcgB+Wcm8kOGMH8IpNeg0H4gjCrlqwDf/GlSXphZGBYxm0QkKEPhh9DTJRp2IDNUhVr0FhP9qCqo2W0recNM=
-----END BITCOIN SIGNED MESSAGE-----

signature chain

Quote

-----BEGIN BITCOIN SIGNED MESSAGE-----
1KN59gRxD8G9g9smSLTFt9aSgWxYxTzFL7
-----BEGIN SIGNATURE-----
1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
HwvtQmiREYIyZeI9uohqr82d9eiwtcBgbhG5+VR7+ouEDOTgd6EYvcgNQVELLVJnQbYhN6SSv1xPtQ8SmIa10+U=
-----END BITCOIN SIGNED MESSAGE-----

The discussion was "is it Satoshi or not, who is it" and so on.

Then the user yhiaali3 mentioned that it could be used to create an NFT.

Quote from: yhiaali3 on Today at 11:13:16 AM

Someone may want to convert old BTC addresses into NFT and sell them for large amounts later, this idea may achieve great profits after 10 years have passed, as these old addresses become of archaeological value as they are old Bitcoin addresses.
In this case, it does not matter whether you own the private key or not, because this address will not be used to send or receive bitcoins, but only as an NFT.

And this we want to test here with that project.

old Bitcoin addresses as 'NFT' on the Bitcoin blockchain