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Block 138725 (30 July 2011) contains a transaction which used the PUSH_BYTES operator to insert a message at the cost of 1 BTC. The message is a combination of ASCII art and text. Len Sassaman (Satoshi) was a Belgian cypherpunk that worked on PGP encryption and P2P networks together with David Chaum. The tribute was made to Len after he took his own life on the 3rd of July 2011. Some think the cryptographer could be Satoshi as he had the technical expertise and interest to have come up with it. Also, Nakamoto’s final forum post before going dark was just 6 months before Len’s death. The addition of former Federal Reserve president Ben Bernanke in this tribute is in line with other digital graffiti, like the message in the genesis block in the wake of the Great Financial crisis of 2008.