There was one signature here, block was around 12k, but this is way earlier.
Yes, earlier ... only few days after Bitcoin started.
But it gets better: these mined coins were transferred in 2011 (txid 567a9a7f9191db644a09985fad113dd6ee770eac69454317430e694305be9c56)
Whoever created that transaction (39 inputs) had private keys of addresses that mined earlier. Here they're talking about transactions that are connected, and this is one of these:
How to know who is Satoshi Nakamoto or the Bitcoin Cinderella shoe.
https://bitcointalk.org/index.php?topic=5159407.0The message in the signature (Bitcoin address 1E9YwDtYf9R29ekNAfbV7MvB4LNv7v3fGa) has recently incoming transactions. People testing/want to know something
