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6 sats \ 0 replies \ @ama OP 4 Dec 2022 \ parent \ on: Mysterious Bitcoin miner shows off oldest signature dated Jan. 2009 bitcoin
I don't think there is any way to figure that out from the blockchain data itself, and I have no idea if someone kept a log of connected peers or something like that, but I guess it could've been well possible.
Ask Satoshi, he probably did it. LOL