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On July 30, 2011, Dan Kaminsky and Travis Goodspeed cleverly added an ASCII portrait and a short text into a Bitcoin transaction in honor of Len Sassaman, who committed suicide on July 3 of the same year, two months after Satoshi sent his last public message.
The hackers published the transaction to many specially created addresses that contained text data instead of public key hashes. Therefore, each line contains exactly 20 characters.
The close proximity of Satoshi's departure and Len's suicide, and the fact that the latter was a brilliant developer involved in the creation of TCP/IP, working on PGP, and many other projects, lead many to believe that he was the person behind the mysterious pseudonym Satoshi Nakamoto.