The most valuable network in crypto history started with exactly one person talking to himself. An analysis of Hal Finney’s debug.log file from Bitcoin’s first days in January 2009 reveals that when Finney connected to the network, only three nodes existed. Two of them belonged to Satoshi Nakamoto.
What the debug file actually shows
The debug.log in question comes from Hal Finney’s Bitcoin client, the very same log shared in early correspondence between Finney and Satoshi. Finney, a cryptographer and one of the first people to ever run Bitcoin software, connected to the network shortly after Satoshi mined the genesis block on January 3, 2009.
When Finney’s node synced up, it could only find three peers on the network. One IP address corresponded to Finney himself. The others belonged to Satoshi, who was running two nodes simultaneously.
The log also reveals that Finney’s client crashed after processing the first 49 blocks. This crash essentially provides a timestamp for early network conditions, freezing a snapshot of what the peer-to-peer landscape looked like when Bitcoin was still measured in dozens of blocks rather than hundreds of thousands.
