This is the oldest signature

(please post if you have a signature with an older address)
-----BEGIN BITCOIN SIGNED MESSAGE-----
1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa
-----BEGIN SIGNATURE-----
1NChfewU45oy7Dgn51HwkBFSixaTnyakfj
HCsBcgB+Wcm8kOGMH8IpNeg0H4gjCrlqwDf/GlSXphZGBYxm0QkKEPhh9DTJRp2IDNUhVr0FhP9qCqo2W0recNM=
-----END BITCOIN SIGNED MESSAGE-----
What's the meaning of the message? "1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa" is just an address with ~2mBTC. Could you sign another message? Preferably this one: "Today is December 4th, 2022, and I sign for topic #5421158". Also, money sent to "1NChfewU45oy7Dgn51HwkBFSixaTnyakfj" were paid in public key (block 1,018), so I'd expect a public key instead of an address. How did you end up with the address anyway (I've checked blockchair, and you're right; I just don't understand the point of this conversion).
Rather than signing dates, they should sign a hash of the block header that was mined 10 minutes ago. This proves it was impossible for a message to be signed by creating plenty of msgs or whatever. It's exciting seeing an early Bitcoin signature, thanks for the entertainment OneSignature.