As far as notable dates in bitcoin’s history go, Dec. 13 is an auspicious one, albeit more lowkey than, say, the publication of the white paper (Oct. 31) or the official launch of the network (Jan. 3). 

No, Dec. 13 is notable for the absence created in its wake: Satoshi Nakamoto, bitcoin’s pseudonymous creator, was last active at 4:45 pm ET on Dec. 13, 2010. 

Their final public message, posted Dec. 12, focused on work on denial-of-service prevention. By that point, Nakamoto had already handed off their role as maintainer of bitcoin’s open-source to developer Gavin Andresen. 

On Dec. 11, 2010, Satoshi Nakamoto expressed concerns on the Bitcointalk forum about the…

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